Under the terms of the Treaty of Paris (1783), which ended the American Revolutionary War, the British abandoned their native allies and ceded the land between the Appalachian Mountains and the Mississippi River to the U.S. government. (The Americans considered this region to be theirs by right of conquest.) Through the Land Ordinance of 1784 and the Northwest Ordinance of 1787, the U.S. government established Northwest Territory in 1787. The U.S. government further subdivided the land north of the Ohio River into the Indiana Territory in 1800 and what became the state of Ohio in 1803.