The following important events in the history of Connecticut affected political boundaries, record keeping, and family movements.
- Before 1625 the Dutch built Fort Goede Hoop, also known as Huys de Hoop as part of their New Netherland colony. It was turned over to the English in 1633 and became Hartford.
- 1633-1636: Puritans from Massachusetts established settlements on the Connecticut River at Windsor, Wethersfield, and Hartford.
- 1638:The New Haven colony was established. New London was founded soon after.
- 1662: A British royal charter established Connecticut as a colony separate from Massachusetts.
- 1740: By this date all of present-day Connecticut had been settled and organized into incorporated towns, the basic governing units.
- 1786-1800: Connecticut relinquished its claims to western lands, except for the Wyoming Valley in [[Pennsylvania]] which Connecticut claimed until 1799, and the Western Reserve in [[Ohio]] which it claimed until 1800. Connecticut settlers remained in both areas.
- 1788: Connecticut ratified the Constitution to become a state.
- 1840s: As the factory system developed, thousands of foreign laborers began moving into Connecticut.
- 1861-1865: Connecticut furnished 60,000 troops to the Union Army during the Civil War.
- 1917–1918:More than 26 million men from the United States ages 18 through 45 registered with the Selective Service. World War I over 4.7 million American men and women served during the war.
- 1930's: The Great Depression closed many factories and mills. Many small farms were abandoned, and many families moved to cities.
- 1940–1945: Over 50.6 million men ages 18 to 65 registered with the Selective Service. Over 16.3 million American men and women served in the armed forces during World War II.
- 1950–1953: Over 5.7 million American men and women served in the Korean War.
- 1950's–1960's The building of interstate highways made it easier for people to move long distances.
- 1964–1972: Over 8.7 million American men and women served in the Vietnam War.
Histories are great sources of genealogical information. Many contain biographical information about individuals who lived in the area, including:
Some of the most valuable sources for family history research are local histories. Published histories of towns, counties, and states usually contain accounts of families. They describe the settlement of the area and the founding of churches, schools, and businesses. You can also find lists of pioneers, soldiers, and civil officials. Even if your ancestor is not listed, information on other relatives may be included that will provide important clues for locating your ancestor. A local history may also suggest other records to search. Local histories are extensively collected by the Family History Library, public and university libraries, and state and local historical societies.
State Histories Useful to Genealogists
Good genealogists strive to understand the life and times of their ancestors. In this sense, any history is useful. But certain kinds of state, county, and local histories, especially older histories published between 1845 and 1945, often include biographical sketches of prominent individuals. The sketches usually tend toward the laudatory, but may include some genealogical details. If these histories are indexed or alphabetical, check for an ancestor's name. Some examples for the State of Connecticut are;
- The Story of Connecticut, is especially helpful source for studying the history of Connecticut 
United States History
The following are only a few of the many sources that are available:
- The Almanac of American History,   This provides brief historical essays and chronological descriptions of thousands of key events in United States history.
- Dictionary of American History, Revised ed   This includes historical sketches on various topics in U.S. history, such as wars, people, laws, and organizations. A snippet view is available at Google books.
- Webster's Guide to American History: A Chronological, Geographical, and Biographical Survey and Compendium    This includes a history, some maps, tables, and other historical information.
To find more books and articles about Connecticut 's history use the Internet Google search for phases like "Connecticut history." Family History Library Catalog Surname Search lists many more histories under topics like:
- CONNECTICUT - HISTORY
- CONNECTICUT. [COUNTY] - HISTORY
- CONNECTICUT, [COUNTY], [TOWN] - HISTORY
- CONNECTICUT, BIBLIOGRAPHY
- Connecticut History Online has photographs, drawings and prints about Connecticut History.
- Connecticut State Library has information about the people in Connecticut's history.
- Filby, P. William. A Bibliography of American County Histories. Baltimore: Genealogical Publishing, 1985. (FHL book 973 H23bi)
- Kaminkow, Marion J. United States Local Histories in the Library of Congress. 5 vols. Baltimore: Magna Charta Book, 1975-76. (FHL book 973 A3ka.)
- Charles W. Burpee's, Burpee's The Story of Connecticut, Four Volumes. (New York: American Historical Company, 1939; Family History Library book 974.6 H2b).
- Schlesinger, Jr., Arthur M. The Almanac of American History. Greenwich, Conn.: Bison Books, 1983. (FHL book 973 H2alm)
- Dictionary of American History, Revised ed., 8 vols. New York: Charles Scribner's Sons, 1976. (FHL book 973 H2ad.)
- Webster's Guide to American History: A Chronological, Geographical, and Biographical Survey and Compendium. Springfield, Mass.: G&C Merriam, 1971. (FHL book 973 H2v)
- Limited view at Google Books
- Writings on American History By American Historical Association, Library of Congress, United States National Historical Publications Commission, Published by KTO Press, 1921 FHL book 973 H23w