-
The Louisiana Purchase was a land deal between the United States and France, in which the U.S. acquired approximately 827,000 square miles of land west of the Mississippi River.
-
Treaty resolving several border issues between the United States and the British North American colonies. Signed under John Tyler's presidency, it resolved the Aroostook War, a nonviolent dispute over the location of the Maine–New Brunswick border.
-
Was the 1845 incorporation of the Republic of Texas into the United States of America, which was admitted to the Union as the 28th state on December 29, 1845.