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The Mississippi River.

in 1783 Spain still had control of everything west or south of the Mississippi river including Florida and the Gulf of Mexico.

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βˆ™ 13y ago
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βˆ™ 8y ago

Prior to about 1800, the crest of the Appalachian Mountains. Around 1800, the Mississippi River was established as the western boundary of the US.

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βˆ™ 7y ago

Prior to the Louisiana Purchase in 1803, the western border of the US was mostly the Mississippi River.

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βˆ™ 14y ago

The Mississippi River.

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βˆ™ 10y ago

New Orleans and St louis

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Q: What river formed the western border of the US in 1800?
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