From 1784 to 1789, considerable violence had erupted between American settlers expanding into Kentucky, along the Ohio River, and at settlements north of the Ohio, and the Shawnee and Miami Indians, resulting in approximately 1,500 settler deaths. However, these tensions had not yet escalated into full-blown war. After the American Revolutionary War, the British had attempted to preserve the Northwest Territory as a Native American reserve, but were forced to cede it to the United States upon independence. American settlers, eager to enter these lands, began doing so in large numbers, prompting the United States to attempt a military solution to the perceived Native American threat.
In Autumn 1790, General Josiah Harmar led a United States Army campaign intended to subdue the confederated Native American nations in the Northwest Territory that were viewed as hostile. The campaign culminated in a series of battles occurring between 19 and 22 October 1790 near Fort Miami and the Miami village of Kekionga.
The Harmar campaign ended in overwhelming victories for the Native Americans, with the battles collectively referred to as Harmar's Defeat. The campaign is considered a significant engagement of the Northwest Indian War, demonstrating the military capability of the confederated Native American nations and marking a major setback for American military efforts in the region during this early period of United States expansion.
The early republic period saw the United States move from the weak Articles of Confederation to the federal Constitution ratified in 1788, with the Bill of Rights added in 1791. George Washington served two terms as president (1789–1797), establishing precedents for executive authority, and the federal capital moved permanently to Washington D.C. in 1800. The Louisiana Purchase (1803) doubled the nation's territory for roughly $15 million, opening vast trans-Mississippi lands to American expansion. The War of 1812 against Britain ended inconclusively but produced a surge of American national identity and eliminated most British support for Indigenous resistance east of the Mississippi. The Northwest Indian Wars (1785–1795) and the Creek War (1813–1814) broke Indigenous confederacies that had resisted US expansion. The Missouri Compromise of 1820 temporarily balanced slave and free states as the nation expanded westward, but embedded the contradiction of slavery in every subsequent territorial debate.
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