The conflict between the United States and Mexico began after the Westward Expansion when American settlers began to settle in Texas, which was part of Mexico. The tension started to arise and brought into conflict when Mexican President Antonio Lopez de Santa Anna is forced to signs a treaty in 1836 by the American government.
United president James K. Polk ordered American naval commander John D. Sloat to seize San Francisco Bay and California's coastal towns in case of war with Mexico. The war did begin and came to be known as the Mexican-American War.
Some people still say African Americans still deal with having their civil rights broken by police and other legal entities like them. But overall yes, having had a african american president, civil rights are greatly expanded and show that equal rights are all around enforced and had by all.
