Ancient burial mounds and forts throughout the region showed evidence of the Hopewell Indians. In the 1600's, European explorers found the Delaware, Shawnee, Mingo, Wyandot, Miami and other Indian tribes living there. At one time both France and Great Britain both held claims to the Ohio area. After the Northwest Territory was established, and the Treaty of Greenville signed, thousands of settlers came to the Ohio region. Among the early settlers were Revolutionary War soldiers who had been given bounty lands in southeast Ohio for their military service.
To connect with trade to the East, Ohio built a 1,000-mile long canal system of eighty-three locks called the Erie Canal, opening in 1825. This made an outlet for the Ohioan’s farms, forests and mines to conduct trade with the outside communities. The railroad arrived in the mid 1800's, turning Ohio into a crossroads for trade and migration.
Ohioans were instrumental in smuggling freedom seeking slaves to Canada by using the Underground Railroad. This resulted in a scattering of small African American communities serving as temporary safe havens in southeastern Ohio.
The following important events in the history of Ohio affected political jurisdictions, family movements, and record keeping.
The following are important dates in the history of Ohio that affected political boundaries, record keeping, and family movements:
- 1656: Iroquois Confederacy claimed Ohio lands after defeating the Erie Indians.
- 1763: The British took possession of the area but discouraged settlers.
- 1772: Moravian misson at Schoenbrunn
- 1777: Moravian mission at Coshocton
- 1772-1824: Moravian Indian land grants, 4,000 acres along the Tuscarawas River in Tuscarawas County.
- 1787: The United States government established the Northwest Territory with the intent to open the land to Revolutionary War veterans and other settlers.
- 1788: The first permanent white settlement was established at Marietta.
- 1794: (August 20,) Battle of Fallen Timbers near Miami River. General Wayne commanding the U.S. forces, this victory ended Indian Wars in the area.
- 1799: Ohio Territory
- 1803: (March 1,) Ohio gained statehood.
- 1805: Land ceded by Ottawa, Wyandot, Chippewa, Potawatomi, Shawnee and Delaware Indians.
- 1807 & 1808: Land ceded by Chippewa, Ottawa, Wyandot, an Potawatomi
- 1817: Land ceded by Ottawa, Wyandot, Chippewa, Potawatomi, Shawnee, Delaware, and Seneca
- 1818: Land ceded by Ottawa, Shawnee, Wyandot and Seneca
- 1818: Land ceded by Wea
- 1818: Land ceded by Miami
- 1843:Wyandot removed to Kansas
- 1861-1865: 310,000 Ohio men served in the Union armed forces during the Civil War.
- 1898: Over 300,000 men were involved in the Spanish-American War which was fought mainly in Cuba and the Philippines.
- 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.
You may want to study local histories for areas such as the Maumee, Miami, Hocking, Muskingum, Scioto, and Mahoning Valleys.
A bibliography of local histories is:
- Ohio Local and Family History Sources in Print 
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 Ohio.
Several multi-volume histories of Ohio were written between 1890 and 1945. Two examples are:
Many editions exist. An index to this book is:
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 Ohio's history use the Internet Google search for phases like "Ohio history." Family History Library Catalog Surname Search lists many more histories under topics like:
- OHIO - HISTORY
- OHIO, [COUNTY] - HISTORY
- OHIO, [COUNTY], [TOWN] - HISTORY
- OHIO, BIBLIOGRAPHY
- Adams, Marilyn, comp. Ohio Local and Family History Sources in Print. Clarkston, Georgia: Heritage Research, 1984. (Family History Library book 977.1 H23o.)
- 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.)
- Howe, Henry. Historical Collections of Ohio. Two Volumes. N.p.: The State of Ohio, 1908, c1888. (Family History Library book 977.1 H2hh 1908; film 1698149 Item 5)
- Day, Sandra H., comp. Index to Howe's Historical Collections of Ohio. Wintersville, Ohio: S.H. Day, 1987-89. (Family History Library book 977.1 H22d; film 1698149 Item 5; fiche 6088090.)
- Wittke, Carl F., ed. The History of the State of Ohio. Six Volumes. Columbus, Ohio: The Society, 1941-1944. (Family History Library book 977.1 H2wi.)
- 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