Which statements best describe effects of the Mexican-American War? Select the two correct answers. U. S. troops were allowed to remain in Mexico and become citizens. International respect for Mexico increased rapidly. The United States was assured of a long-term military alliance with Mexico. The total U. S. population significantly increased. The United States gained new territories and key ports from Mexico. Mexican plantation owners were encouraged to move to the United States.

The total U. S. population significantly increased.

The United States gained new territories and key ports from Mexico.

Explanation:

The "Mexican-American War" started with a dispute between Mexico and the United States over Texas. Under President James Polk, Texas was then admitted into the union and this caused a tension regarding the borders between Mexico and the U. S. Boundary adjustments were sought but it failed, thus leading to the war. Mexico then fell during the war thus, they negotiated with the U. S. through the "Treaty of Guadalupe Hidalgo."

The treaty resulted into the United States gaining new territories and key ports from Mexico. It also gave up its claim on Texas and recognized the Rio Grande as a southern border for the American territory. Mexico was then paid $15 million. Since the U. S. gained new territories, this significantly increased the U. S. population.