The Louisiana Purchase (1803) was the United States' acquisition of France's territorial claim to approximately 828,000 square miles (2.14 million km²) of North America for $15 million. Negotiated under President Thomas Jefferson (in office 1801–1809), it nearly doubled the republic's claimed territory, secured control of New Orleans and the Mississippi trade corridor, and accelerated westward exploration and expansion.
By 1804, the United States was organizing its newly acquired territories while the Lewis and Clark expedition explored the Missouri River. Yet the purchase's boundaries remained disputed, Spain and Britain maintained competing claims, and Indigenous nations governed much of the continent's interior. American expansion intensified conflicts over land, sovereignty, and slavery, laying the foundations for the later ideology of Manifest Destiny and the sectional tensions preceding the American Civil War (1861–1865).
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APA Style
Netchev, S. (2026, October 24). Map of the Louisiana Purchase, North America in 1804: U.S. Expansion, Rival Claims & Indigenous Nations. World History Encyclopedia. https://www.worldhistory.org/image/19608/map-of-the-louisiana-purchase-north-america-in-180/
Chicago Style
Netchev, Simeon. "Map of the Louisiana Purchase, North America in 1804: U.S. Expansion, Rival Claims & Indigenous Nations." World History Encyclopedia, October 24, 2026. https://www.worldhistory.org/image/19608/map-of-the-louisiana-purchase-north-america-in-180/.
MLA Style
Netchev, Simeon. "Map of the Louisiana Purchase, North America in 1804: U.S. Expansion, Rival Claims & Indigenous Nations." World History Encyclopedia, 24 Oct 2026, https://www.worldhistory.org/image/19608/map-of-the-louisiana-purchase-north-america-in-180/.
