Which early 19th century land acquisition doubled the territory of the united states?

The correct answer is Louisiana Purchase

Basically, France lost a war with Britain and the United States believed that Britain might ask for the territory in order to come back to the continent. In order to prevent this, they decided to buy the territory from France which doubled the territory of the United States and opened up further passages to the west. Thomas Jefferson was the president who approved of this.

South carolina was so angry about the election of lincoln that they seceded from the union on december 20, 1860. they attacked fort sumter later, on april 12, 1861.