The expansion of the continental United States was made complete by:
a. The Louisiana Purchase
b. The annexation of Texas
c. The Mexican Cession
d. The Gadsden Purchase

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Answer:

The expansion of the United States into the territory west of the Mississippi River began with the Louisiana Purchase in 1803. President Thomas Jefferson nearly doubled the size of the nation by negotiating a price of $15 million to purchase 828,800 square miles from France, including all or part of 14 current states.

Explanation:

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I think the answer is C. The Mexican Cession.