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Although not involved in the last conflict (1754–63) of the French and Indian Wars, Missouri was affected by the French defeat when, in 1762, France secretly ceded the territory west of the Mississippi to Spain. Although few Spaniards settled Missouri, many U.S. miners and farmers entered from Mississippi.

Although not involved in the last conflict (1754–63) of the French and Indian Wars, Missouri was affected by the French defeat when, in 1762, France secretly ceded the territory west of the Mississippi to Spain. Although few Spaniards settled Missouri, many U.S. miners and farmers entered from Mississippi.

In 1800, France reclaimed the Louisiana Territory and in 1803, sold it to the United States as part of the Louisiana Purchase. French influence remained dominant, even though by this time Americans had filtered into the territory, particularly to the lead mines at Ste Geneviève and Potosi. By the time of the Lewis and Clark expedition (1803–6), St. Louis was already known as the gateway to the Far West.

In 1800, France reclaimed the Louisiana Territory and in 1803, sold it to the United States as part of the Louisiana Purchase. French influence remained dominant, even though by this time Americans had filtered into the territory, particularly to the lead mines at Ste Geneviève and Potosi. By the time of the Lewis and Clark expedition (1803–6), St. Louis was already known as the gateway to the Far West.

The Missouri Territory was organized in 1812., but settlement was slow even after the War of 1812. The coming of the steamboat increased traffic and trade on the Mississippi, and settlement progressed. Planters from the South had introduced slavery into the territory, but their plantations were restricted to a small area.

The Missouri Territory was organized in 1812., but settlement was slow even after the War of 1812. The coming of the steamboat increased traffic and trade on the Mississippi, and settlement progressed. Planters from the South had introduced slavery into the territory, but their plantations were restricted to a small area.

As people flooded into Missouri, Native Americans grew angry and began raiding settlements. During the War of 1812, Britain supplied the Indians with weapons and encouraged them to attack Missouri settlements. Not until 1815 did the attacks end with a peace treaty at Portage des Sioux. By 1825, few Native Americans lived in Missouri.

As people flooded into Missouri, Native Americans grew angry and began raiding settlements. During the War of 1812, Britain supplied the Indians with weapons and encouraged them to attack Missouri settlements. Not until 1815 did the attacks end with a peace treaty at Portage des Sioux. By 1825, few Native Americans lived in Missouri.