| DATE | Event Description |
| 1614 | Adriaen Block, representing the Dutch, sails up the Connecticut River. |
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| 1633 | The Dutch erect a fort, the House of (Good) Hope, on the future site of Hartford. |
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| 1633 | John Oldham and others explore and trade along the Connecticut River. |
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| 1633 | Plymouth Colony sends William Holmes to found a trading post at Windsor. |
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| 1634 | Wethersfield founded by people from Massachusetts. |
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| 1634 | First English arrive in Windsor. |
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| 1635 | Fort erected at Saybrook by Lion Gardiner. |
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| 1635 | Group from Dorchester, Massachusetts join Windsor settlement. |
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| 1636 | Thomas Hooker and company journey from Newtown (Cambridge), Massachusetts to found Hartford. |
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| 1637 | Pequot War. Captain John Mason leads colonists to decisive victory. |
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| 1638 | New Haven Colony established by John Davenport and Theophilus Eaton. |
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| 1639 | Fundamental Orders of Connecticut adopted by Freemen of Hartford, Wethersfield and Windsor; John Haynes chosen first Governor. |
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| 1643 | Connecticut joins in forming the New England Confederation. |
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| 1646 | New London founded by John Winthrop, Jr. |
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| 1650 | Code of laws drawn up by Roger Ludlow and adopted by legislature. |
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| 1662 | John Winthrop, Jr. obtains a charter for Connecticut. |
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| 1665 | Union of New Haven and Connecticut Colonies completed. |
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| 1665 | The first division of any Connecticut town--Lyme's separation from Saybrook. |
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| 1675-76 | Connecticut participates in King Philip's War which was fought in Rhode Island and Massachusetts. |
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| 1687 | Andros assumes rule over Connecticut; Charter Oak episode occurs. |
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| 1689 | Connecticut resumes government under charter. |
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| 1701 | Collegiate School authorized by General Assembly. |
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| 1708 | Saybrook Platform permits churches to join regional consociations. |
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| 1717 | New Haven State House erected on the Green. |
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| 1717 | Collegiate School moves to New Haven; called Yale the next year. |
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| 1740 | Manufacture of tinware begun at Berlin by Edward and William Pattison. |
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| 1740s | Height of religious "Great Awakening". |
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| 1745 | Connecticut troops under Roger Wolcott help capture Louisburg. |
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| 1755 | Connecticut Gazette of New Haven, the Colony's first newspaper, printed by James Parker at New Haven. |
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| 1763 | Brick State House erected on New Haven Green. |
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| 1764 | Connecticut Courant, the oldest American newspaper in continuous existence to the present, launched at Hartford by Thomas Green. |
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| 1765 | Sharp opposition to Stamp Act. |
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| 1766 | Governor Thomas Fitch who refused to reject the Stamp Act defeated by William Pitkin. |
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| 1767 | Thomas and Samuel Green launch newspaper which after many changes becomes New Haven Journal-Courier. |
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| 1774 | Connecticut officially extends jurisdiction over Susquehanna Company area in Northern Pennsylvania. |
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| 1774 | Silas Deane, Eliphalet Dyer, and Roger Sherman represent Connecticut at First Continental Congress. |
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| 1775 | Several thousand militia rush to Massachusetts in "Lexington Alarm." |
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| 1775 | Connecticut men help plan and carry out seizure of Ft. Ticonderoga. |
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| 1775 | First gun powder mill in Connecticut started in East Hartford. |
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| 1776 | Samuel Huntington, Roger Sherman, William Williams and Oliver Wolcott sign the Declaration of Independence; large majority of Connecticut people under Governor Jonathan Trumbull support the Declaration. |
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| 1777 | British troops under General Tryon raid Danbury. |
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| 1779 | British troops under General Tryon raid New Haven, Fairfield and Norwalk. |
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| 1781 | Benedict Arnold's attack upon New London and Groton involves massacre at Fort Griswold. |
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| 1781 | Washington and Rochambeau confer at Webb House in Wethersfield. |
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| 1783 | Meeting of 10 Anglican clergy at Glebe House, Woodbury, leads to consecration of Bishop Samuel Seabury and beginning of Protestant Episcopal Church in United States. |
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| 1784 | Tapping Reeve established the first law school in the United States in Litchfield. |
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| 1784 | Earliest Connecticut cities incorporated--Hartford, Middletown, New Haven, New London and Norwich. |
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| 1784 | Governor Trumbull retires from governorship. |
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| 1784 | Connecticut relinquishes Westmoreland area to Pennsylvania. |
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| 1784 | Act passed providing for emancipation at age of twenty-five of all Negroes born after March 1784. |
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| 1785 | First Register and Manual published. |
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| 1787 | Oliver Ellsworth, William Samuel Johnson and Roger Sherman serve as Connecticut's representatives at Philadelphia Constitutional Convention. |
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| 1788 | Convention at Hartford approves Federal Constitution by 128-40 vote. |
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| 1789 | Oliver Ellsworth and William Samuel Johnson begin service as first United States Senators from Connecticut. |
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| 1792 | First turnpike road company, New London to Norwich, incorporated. |
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| 1792 | First banks established at Hartford, New London and New Haven. |
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| 1793-96 | Old State House, Hartford, erected; designed by Charles Bulfinch. |
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| 1795 | Connecticut Western Reserve lands (now Northeastern Ohio) sold for $1,200,000 and the proceeds were used to establish the School Fund. |
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| 1795 | First insurance company incorporated as the Mutual Assurance Company of the City of Norwich. |
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| 1796 | Thomas Hubbard starts Courier at Norwich. In 1860 paper merges with the Morning Bulletin and continues as Norwich Bulletin to present. |
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| 1799 | Eli Whitney procures his first Federal musket contract; within next decade develops a system of interchangable parts, applicable to industries. |
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| 1802 | Brass industry begun at Waterbury by Abel Porter and associates. |
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| 1806 | First important English dictionary in United States published by Noah Webster. |
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| 1810 | Hartford Fire Insurance Company incorporated. |
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| 1812 | Joseph Barber starts Columbian Register at New Haven. In 1911 combined with New Haven Register and continues as Register to present. |
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| 1812-14 | War of 1812 unpopular in Connecticut; new manufactures, especially textiles, boom. |
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| 1814 | Hartford Convention held in Old State House. |
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| 1815 | First steamboat voyage up the Connecticut River to Hartford. |
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| 1817 | Federalists defeated by reformers in political revolution. |
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| 1817 | Thomas Gallaudet found school for the deaf in Hartford. |
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| 1817 | Hartford Times founded by Frederick D. Bolles and John M. Niles. |
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| 1818 | New Constitution adopted by convention in Hartford and approved by voters; ends system of established church. |
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| 1820 | Captain Nathaniel Palmer of Stonington discovers the continent of Antarctica. |
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| 1822 | Captain John Davis of New Haven becomes first man to set foot on the Antarctic Continent. |
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| 1823 | Washington College (now Trinity) founded in Hartford. |
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| 1827 | "New" State House erected in New Haven; Ithiel Town, architect. |
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| 1828 | Farmington Canal opened. |
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| 1831 | Wesleyan University founded in Middletown. |
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| 1831 | Mutual Insurance Company of Hartford founded. |
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| 1832 | First Connecticut railroad incorporated as the Boston, Norwich and New London. |
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| 1835 | Revolver patented by Colt. |
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| 1835 | Music Vale Seminary, first American music school, founded at Salem by Oramel Whittlesey. |
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| 1838 | Railroad completed between New Haven and Hartford. |
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| 1839-41 | The Amistad affair. |
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| 1840s-50s | Peak of whaling from Connecticut ports and especially from New London. |
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| 1842 | Wadsworth Atheneum, Hartford, first public art museum, established. |
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| 1843 | Charles Goodyear develops vulcanizing process for rubber. |
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| 1843 | Civil rights of Jews protected through act guaranteeing equal privileges with Christians in forming religious societies. |
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| 1844 | Dr. Horace Wells uses anesthesia at Hartford. |
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| 1846 | Connecticut Mutual Life Insurance Company, the first life insurance company, chartered in Connecticut. |
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| 1847 | First American agricultural experiment station--at Yale. |
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| 1848 | Slavery abolished in Connecticut. |
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| 1849 | First teachers' college founded at New Britain (now Central Connecticut State University). |
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| 1851 | Phoenix Mutual Life Insurance Company started (under another name) in Hartford. |
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| 1853 | Aetna Life Insurance Company started in Hartford. |
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| 1858 | Famous Charter Oak tree felled in a storm. |
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| 1860 | Lincoln speaks in several Connecticut cities. |
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| 1861-65 | Approximately 55,000 men serve in Union Army; William Buckingham wartime governor. |
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| 1864 | Travelers Insurance issues its first policy. |
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| 1865 | Connecticut General Life Insurance Company founded. |
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| 1868 | Land at Groton given by Connecticut to U.S. Navy for a naval station; in April. |
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| 1875 | Hartford made sole capital city. |
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| 1877 | First telephone exchange in world opened in New Haven. |
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| 1879 | New Capitol building in Hartford completed; Richard Upjohn, architect. |
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| 1881 | Storrs Agricultural College founded (became University of Connecticut in 1939). |
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| 1890 | Disputed election causes Morgan Bulkeley to continue two extra years as governor (1891-93). |
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| 1897 | Manufacture of automobiles begun by Pope Manufacturing Company of Hartford. |
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| 1900 | First United States Navy submarine, Holland, constructed by Electric Boat Co. |
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| 1901 | First American state law regulating automobile speeds. |
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| 1902 | Constitutional Convention held; proposed new constitution defeated in a statewide referendum. |
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| 1905 | General Assembly adopted public accommodations act ordering full and equal service in all places of public accommodation. |
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| 1907 | The first Boy Scout Troop in Connecticut (Troop 1) was established in East Hartford. |
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| 1910 | U.S. Coast Guard Academy moves to New London. |
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| 1911 | Connecticut College for Women founded at New London. |
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| 1917 | U.S. Navy Submarine School formally established at New London Naval Base, Groton. |
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| 1917-18 | Approximately 67,000 Connecticut men serve in World War 1. |
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| 1920 | University of New Haven founded. |
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| 1927 | University of Bridgeport founded. |
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| 1932 | St. Joseph College founded in West Hartford. |
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| 1936 | Floods cause enormous damage in Connecticut River Valley. |
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| 1938 | Hurricane and floods produce heavy loss of life and property. |
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| 1938 | First section of Merritt Parkway opened. |
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| 1939 | First section of Wilbur Cross Parkway opened. |
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| 1941-45 | Approximately 210,000 Connecticut men serve in World War II. |
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| 1943 | General Assembly established Inter-Racial Commission, recognized as the nation's first statutory civil rights agency. |
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| 1944 | Ringling Brothers Circus tent fire in Hartford took 168 lives. |
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| 1947 | Fair Employment Practices Act adopted Outlawing job discrimination. |
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| 1950-52 | Approximately 52,000 Connecticut men serve in Korean War, |
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| 1954 | Nautilus, world's first atomic-Powered submarine, launched at Groton. |
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| 1955 | Serious floods cause heavy damage and loss of life. |
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| 1955 | Shakespeare Memorial Theater opened at Stratford. |
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| 1957 | University of Hartford founded. |
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| 1957 | Ground broken for first building in New Haven's Oak Street redevelopment area. |
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| 1958 | 129-mile Connecticut Turnpike opened. |
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| 1959 | General Assembly votes to abolish county government (effective 1960); also to abolish local justice courts and establish district courts. |
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| 1960 | Ground broken for first building in Hartford's Front Street redevelopment area; now known as Constitution plaza. |
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| 1961 | New state circuit court system goes into effect. |
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| 1962-75 | Approximately 104,000 Connecticut men and women served in the armed forces during the Vietnam War era. |
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| 1964 | General Assembly creates six Congressional districts reasonably equal in population. |
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| 1965 | Constitutional Convention held. New Constitution approved by voters. |
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| 1966 | First elections held for reapportioned General Assembly under new Constitution. |
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| 1968 | Connecticut Society of Genealogists established to preserve the rich genealogical heritage of Connecticut and surrounding states. |
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| 1972 | Under constitutional amendment adopted in 1970, General Assembly held first annual session since 1886. |
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| 1974 | Ella Grasso, first woman elected Governor in Connecticut. |
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| 1978 | Common pleas and juvenile courts become part of the superior court. |
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| 1982 | Appellate Court created by Constitutional Amendment (Effective July 1, 1983). |
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| 1990 | Eunice S. Groark, first woman elected lieutenant governor in Connecticut. |
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| 2001 | Reapportionment Commission creates five Congressional districts due to national population shifts identified in the 2000 census. |
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