-
Period: to
Westward Expansion
-
Louisiana Purchase
The United States bought 828,000 square miles of land west of the Mississippi River for $15 million from France -
British Cession
established the boundary between U.S. and Canadian territories at the 49th parallel -
Adams-Onis
one of the critical events that defined the U.S.-Mexico border -
Texas Annexation
Entered as the 26th state -
Mexican Cession
The United States bought about half of the Mexican Republic's territory for 15 million -
Gadsden purchase
United States bought 45,535 sq. mi. for 10 million dollars from Mexico -
Oregon Territory
Land claimed by both the United States and Great Britain. This was an ongoing dispute until the Treaty of 1846, which set the boundary at the 49th parallel, where it is today.