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The US acquired free navigation of the Mississippi River in 1795. This was established through a treaty which Pinckney negotiated.
The Louisiana Purchase.
The Mississippi River formed the eastern border of the Louisiana Territory, which was acquired by the United States from France in 1803.
The Louisiana Purchase
Louisiana, Mississippi and Alabama
It was acquired after the Revolution when the United States got all the land from the Atlantic Ocean to the Mississippi. They also got land from the Louisiana purchase and from the war against Mexico.
The area that is today the state of Minnesota was acquired by the United States in two separate events. First, the U.S. acquired the portion of Minnesota that is east of the Mississippi River as part of the Northwest Territory, a region that England and its American colonists won from France in the French and Indian War (1754-1763). Later, the U.S. acquired the portion of Minnesota that is west of the Mississippi River in the Louisiana Purchase of 1803.
The US bought the land of the Mississippi valley and west from France that is called the Lousiana Purchase.
Louisiana, Mississippi and Alabama
David Holmes was the first governor of Mississippi after it acquired statehood. He served from December 10, 1817 to January 5, 1820. However, Winthrop Sargent was the first governor of Mississippi Territory, serving from May 7, 1798 to May 25, 1801.
The Treaty of Paris which ended the American Revolutionary War included provisions that ceded this territory from Britain.
Britain claimed all of North America east of the Mississippi River, this also included Florida, which britain acquired from Spain, an ally of France.