3) Which of these caused the United States to grow the most? A) land won from the Mexican War B) the annexation of Alaska C) the Louisiana Purchase D) the Gadsden Purchase

C) the Louisiana Purchase.

Explanation:

The Lousiana Purchase added 828,000 square miles to the US territory in 1803. In comparison, the US won 525,000 square miles with signing the Treaty of Guadalupe Hidalgo that ended the Mexican-American War in February 1848.

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