| 1634 | Wethersfield founded by colonists from Massachusetts. |
| 1634 | First English settlers arrive in Windsor. |
| 1636 | Thomas Hooker and company journey from Newtown (Cambridge), Massachusetts, to found Hartford and build the first Meeting House on the spot where the Old State House now stands. Illustration of Hartford Colony's first Meeting House |
| 1638 | New Haven Colony established by John Davenport and Theophilus Eaton. |
| 1639 | Fundamental Orders of Connecticut adopted by Freemen of Hartford, Wethersfield and Windsor; John Haynes chosen first Governor. |
| 1643 | Connecticut joins in forming the New England Confederation. |
| 1650 | Code of Laws drawn up by Roger Ludlow and adopted by legislature. |
| 1662 | John Winthrop, Jr. obtains a Charter for the Colony of Connecticut. |
| 1662 | Two representatives elected from each town. |
| 1665 | Union of New Haven Colony and the Connecticut Colony completed. |
| 1687 | Edmund Andros assumes rule over Connecticut; Charter Oak episode occurs. |
| 1689 | Connecticut resumes government under Charter. |
| 1701 | Collegiate School authorized by General Assembly. |
| 1717 | First New Haven State House erected on the Green. |
| 1717 | Collegiate School moves to New Haven; renamed Yale the next year. |
| 1763 | Brick State House erected on New Haven Green. |
| 1774 | Connecticut officially extends jurisdiction over Susquehanna Company area in Northern Pennsylvania. |
| 1774 | Silas Deane, Eliphalet Dyer, and Roger Sherman represent Connecticut at First Continental Congress. |
| 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. |
| 1781 | Generals George Washington and comte de Rochambeau confer at Webb House in Wethersfield. |
| 1784 | Earliest Connecticut cities incorporated--Hartford, Middletown, New Haven, New London and Norwich. |
| 1784 | Connecticut relinquishes Westmoreland area to Pennsylvania. |
| 1784 | Gradual Emancipation Act passed providing for emancipation at age of twenty-five of all African- Americans born after March 1784. In 1797 the age was lowered to 21. |
| 1785 | First Register and Manual published. |
| 1787 | Oliver Ellsworth, William Samuel Johnson and Roger Sherman serve as Connecticut's representatives at Philadelphia Constitutional Convention. |
| 1788 | Convention at Hartford approves Federal Constitution by 128-40 vote. |
| 1789 | Oliver Ellsworth and William Samuel Johnson begin service as first United States Senators from Connecticut. |
| 1793-96 | Old State House, Hartford, erected; designed by Charles Bulfinch. |
| 1814 | Hartford Convention held in Old State House. |
| 1817 | Federalists defeated by reformers in political revolution. |
| 1818 | New Constitution adopted by convention in Hartford and approved by voters; ends system of established church. |
| 1827 | "New" State House erected on New Haven Green; Ithiel Town, architect. |
| 1839-41 | The Amistad legal case heard before the U.S. Supreme Court. |
| 1843 | Civil rights of Jews protected through act guaranteeing equal privileges with Christians in forming religious societies. |
| 1860 | Lincoln speaks in several Connecticut cities. |
| 1861-65 | Approximately 55,000 men serve in Union Army; William Buckingham serves as wartime governor. |
| 1880 | New Capitol building in Hartford completed; Richard M. Upjohn, architect. Vintage photo of the chamber of the House of Representatives |
| 1901 | First American state law regulating automobile speeds. |
| 1902 | Constitutional Convention held; proposed new Constitution defeated in a statewide referendum. |
| 1905 | General Assembly adopts public accommodations act ordering full and equal service in all places of public accommodation. |
| 1931 | New State Office Building completed in Hartford. |
| 1943 | General Assembly establishes Inter-Racial Commission, recognized as the nation's first statutory civil rights agency. |
| 1947 | Fair Employment Practices Act adopted outlawing job discrimination. |
| 1959 | General Assembly votes to abolish county government (effective 1960); also to abolish local justice courts and establish district courts. |
| 1961 | New state circuit court system goes into effect. |
| 1964 | U.S Supreme Court reapportionment decision, Reynolds v. Sims. This case led to the Constitutional Convention of 1965. |
| 1965 | Current Connecticut Constitution ratified. One person one vote. Proportional representation begins. |
| 1966 | First elections held for reapportioned General Assembly under new Constitution. |
| 1966 | Constance Baker Motley of New Haven, first African-American woman appointed to be a federal judge. |
| 1970 | Legislature meets every year. |
| 1972 | Under constitutional amendment adopted in 1970, General Assembly holds first annual session since 1886. |
| 1974 | Former State Representative Ella Grasso becomes first female Governor in U.S. history elected in her own right. |
| 1978 | Common pleas and Juvenile Courts become part of the Superior Court. |
| 1982 | Appellate Court created by Constitutional Amendment (Effective July 1, 1983.) |
| 1988 | Legislative Office Building constructed and renovation of the State Capitol completed. |
| 1990 | Eunice S. Groark, first woman elected Lieutenant Governor in Connecticut. |
| 1991 | State Income Tax passes. |
| 1995-97 | First time in history where all of the newly elected state executive officers had previously served as members of the Connecticut House at one time. |
| 1995-97 | President of Poland and recipient of the Nobel Peace Prize, Lech Walesa, addresses the Joint Convention of the State Legislature. |
| 1997 | Thomas D. Ritter elected to unprecedented third term as Speaker. |
| 1999 | Moira K. Lyons becomes first woman to serve as Speaker of the House. |
| 2001 | Reapportionment Commission creates five Congressional districts due to national population shifts identified in the 2000 census. |
| 2005 | Connecticut first state to adopt civil unions for same-sex couples without being directed to do so by a court. |
| 2006 | M. Jodi Rell becomes Connecticut's second female Governor elected in her own right. |
