1600–1650
Ohio is home to numerous Indigenous nations and trade networks. The
region serves as an important crossroads between peoples of the Great
Lakes, the Ohio Valley, and the Mississippi Valley.
1640s–1660s
The Beaver Wars reshape the Ohio Country. The Haudenosaunee
(Iroquois Confederacy), seeking control of the fur trade, expand westward
and exert influence over much of present-day Ohio.
1669–1670
French explorer René-Robert Cavelier, Sieur de La Salle
may have traveled through portions of the Ohio Valley during his early
explorations, though historians continue to debate the exact route.
1671
French official Simon-François Daumont de Saint-Lusson
formally claims vast interior lands, including the Ohio Country, for
France at a ceremony near Sault Ste. Marie.
1682
Explorer La Salle claims the Mississippi River basin
for France as "Louisiana," strengthening French claims to the Ohio Country.
1690s
French traders and missionaries increasingly travel through the Ohio
Valley, establishing trade relationships with Indigenous communities.
1701
The Great Peace of Montreal ends decades of warfare
between New France and many Indigenous nations, helping stabilize trade
and travel routes through the Great Lakes and Ohio region.
1715–1730
Shawnee, Delaware (Lenape), and other Native peoples establish or
reestablish villages throughout Ohio after periods of displacement
caused by earlier conflicts.
1744
At the Treaty of Lancaster, Iroquois leaders negotiate
with British colonies and assert authority over lands in the Ohio Valley,
influencing future colonial claims.
1748
The Ohio Company of Virginia receives a land grant and
begins promoting British settlement and trade in the Ohio Country,
increasing rivalry with France.
1748
British traders establish Fort Pickawillany near
present-day Piqua, creating one of the most important early British
trading centers in present-day Ohio.
1749
French officer Pierre-Joseph Céloron de Blainville
leads an expedition through the Ohio Valley, including areas now known
as East Liverpool, Steubenville, and near present-day Marietta, burying
lead plates claiming the region for France.
1750–1751
Explorer and surveyor Christopher Gist travels through
eastern and central Ohio on behalf of the Ohio Company, producing some
of the first detailed English descriptions of the region.
1752
The French construct Fort Miami near present-day
Defiance along the Maumee River. It serves as a key link between
Detroit and the Ohio Country.
1752
French-allied warriors under Charles de Langlade attack
and destroy Pickawillany, killing Miami chief Memeskia and driving out
British traders. The event is often viewed as a precursor to the French
and Indian War.
1753
Virginia Governor Robert Dinwiddie sends young surveyor
and militia officer George Washington through the Ohio
Country to challenge French expansion and deliver a diplomatic message
to French commanders.
1754
The French and Indian War begins. Control of the Ohio
Country becomes a central issue in the struggle between France and
Great Britain in North America.
1755
British General Edward Braddock leads an expedition
toward French positions but is defeated near the Monongahela River,
highlighting the strategic importance of the frontier.
1758
British forces capture Fort Duquesne at the forks of
the Ohio River (present-day Pittsburgh), weakening French control of
the Ohio Country.
1760
French military power in North America collapses as British forces
secure control of former French territories, including the Ohio region.
1761
The British establish Fort Sandusky on Sandusky Bay
near present-day Sandusky, one of the first British military posts in
present-day Ohio.
1763
The Treaty of Paris formally ends the French and Indian
War. France cedes its claims east of the Mississippi River to Great
Britain, including the Ohio Country.
1763–1766
Pontiac's War erupts as Indigenous nations resist
British control of the Great Lakes and Ohio Valley. During the conflict,
Native forces capture and destroy Fort Sandusky.
1768
The Treaty of Fort Stanwix establishes a new boundary
between colonial settlement and Native lands, opening portions of the
Ohio Valley to increased British interest and speculation.
1771–1775
Frontiersman Simon Kenton makes several journeys into
present-day Ohio, traveling through the Scioto and Mad River valleys
and providing some of the earliest accounts of the region by an
American frontiersman.
1772
Moravian missionary David Zeisberger establishes the
mission village of Schoenbrunn near present-day New Philadelphia, the
first organized Christian settlement in present-day Ohio.
1774
Lord Dunmore's War pits Virginia militia against Shawnee
and Mingo forces. The conflict culminates in the
Battle of Point Pleasant at the junction of the Kanawha
and Ohio Rivers. The resulting treaty affects Shawnee lands throughout
southern Ohio, including the Scioto Valley.
1775
As the American Revolution begins, Ohio remains largely Native-controlled,
though British, Virginian, and land-company interests compete for
influence throughout the region.
1778
American forces under George Rogers Clark conduct
campaigns in the Ohio Country, weakening British influence among
Native allies.
1782
The Gnadenhutten Massacre occurs near present-day
Gnadenhutten, where Pennsylvania militiamen kill 96 Christian Delaware
Indians, one of the most tragic events in Ohio frontier history.
1783
The Treaty of Paris ends the American Revolution.
Great Britain formally cedes the Ohio Country to the United States.
1785
Congress adopts the Land Ordinance of 1785, establishing
the township-and-range survey system that still shapes Ohio's landscape
today.
1786
Surveying begins in eastern Ohio in the Seven Ranges,
the first federally surveyed lands in the Northwest Territory.
1787
The Northwest Ordinance creates the Northwest Territory
and establishes a path to statehood for future states including Ohio.
1788
Marietta is founded by settlers of the Ohio Company of
Associates at the confluence of the Ohio and Muskingum Rivers. It becomes
the first permanent American settlement in present-day Ohio.
1788
Territorial Governor Arthur St. Clair formally
establishes Washington County, the first county in the Northwest Territory.
1790
Losantiville, the settlement that would become Cincinnati,
is laid out along the Ohio River.
1792
Losantiville is renamed Cincinnati by Governor St. Clair
in honor of the Society of the Cincinnati.
1794
American forces under Anthony Wayne defeat a Native
confederacy at the Battle of Fallen Timbers near
present-day Toledo.
1795
The Treaty of Greenville opens much of southern and
eastern Ohio to American settlement and becomes a turning point in
Ohio's development.
1796
Cleveland is founded by surveyors of the Connecticut
Land Company led by Moses Cleaveland.
1797
Chillicothe is established and soon becomes a major
political center of early Ohio.
1800
The Northwest Territory is divided, and Chillicothe
becomes the capital of the remaining Northwest Territory.
1803
Ohio is admitted as the 17th state in the Union.
