What was the result of the Mexican-American War? United States took land from Mexico in the Treaty of Guadalupe-Hidalgo
United States becomes a vassal of Mexico
Free States expanded and ended slavery in the USA
United States, Mexico, and Canada agree to NAFTA

The war—in which U.S. forces were consistently victorious—resulted in the United States' acquisition of more than 500,000 square miles (1,300,000 square km) of Mexican territory extending westward from the Rio Grande to the Pacific Ocean.

Explanation:

in all honesty, it really hasn't. except that hitler killed himself.