Question

Which of the following doubled the size of the United States in 1803?
A. The Civil War
B. The Louisiana Purchase
C. The American Revolution
D. The Industrial Revolution

Answer 1

It was "B. The Louisiana Purchase" that doubled the size of the United States in 1803, since this was purchased by Thomas Jefferson from France, which owned a massive amount of land west of the colonies. 

Answer 2

Answer:

B. The Louisiana Purchase

Explanation:

The Lands owned by France were bought by the US for sixty-eight million francs (although a portion of it was actually a cancellation of debts). This increase the territory of the country from the Mississippi River to the Rocky Mountains and doubled the size of the United States