Answer:
D.
Step-by-step explanation:
The Louisiana Purchase was a land deal done between France and the United States in 1803. The United States purchased Louisiana territory from France under the presidency of Jefferson.
The purchase had several affects on the United States. First, it doubled the size of the United States. Secondly, it helped to resolve the slavery issue between the North and the South through Missouri Compromise.
Therefore, option D is correct.