Ohio Becomes a State By mbuchanan Apr 1, 1754 French and Indian War Begins Apr 23, 1775 Revolutionary War Begins Apr 23, 1783 Ohio was acquired from England Ohio was acquired from England Mar 1, 1786 Ohio Company of Associates was formed Apr 23, 1787 Ohio became part of the Northwest Territory Apr 7, 1788 Ohio's first permanent settlement was founded at Marietta Nov 23, 1788 Columbia became the 2nd permanent settlement Apr 23, 1789 Fort Harmar was Erected Aug 3, 1795 Treaty of Greenville Signed Apr 23, 1800 Chillicothe became to capital of the Northwest Territory Apr 23, 1802 Formation of stste government was authorized by Congress Mar 1, 1803 Ohio becomes a state