Answer:
C. The United States gained large amounts of land because of the Mexican-American War.
Explanation:
The United States territory grew by ~1/3 after obtaining ~500,000 sq mi of land from Mexico, not including the Gadsen Purchase which expanded the territories to the current border.
Why the answers can be, but shouldn't be the others:
A) The Mexican-American War is a victory for the United States, but there are much more important wars fought by the United States that had a greater impact to the US itself, as well as the world. Examples of this can be the American Revolutionary War (which led to the creation of the US in the first place), as well as the World Wars, in which the first set the US up as a industrial powerhouse, and the second as a world superpower.
B) A portion of Mexico's economic problems may stem from its losses in war in history with the United States, however, not all of today's problems could or even should be attributed to the US all the way back to the Mexican-American War. Poor government, failure to keep cartels in check, and corruption in both the Mexican police force and military force has led to Mexico having many internal problems.
D) Both sides can be argued on whether or not it was correct for the United States to start a Mexican-American War, as Mexico had previously shown signs of aggression, and the United States simply moved to eliminate the threat as best as possible. However, that is not to say that the United States is not entirely at fault, just that they are not entirely wrong either.
Learn more about the Mexican-American war, here:
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