Answer :
The Mexican-American War
Explanation :
The Mexican-American War allowed for the United States to gain and conquer the Southwest. This war also caused sectional conflict in the years leading up to the Civil War.
Fredrick Douglas was the African American who said the Mexican War was "disgraceful" because he thought if America would annex Mexico then slavery would be carried over into the new territory.
The Romans brought the benefits of Roman civilization and culture to conquered territories,and thus assimilated their populations (at least,those that hadn't been killed or enslaved during the conquest) into the empire as a whole.
The purpose of this was to win conquered peoples over to the Roman way of life - a higher and more advanced standard of living would reconcile them to Roman rule.
Sometimes though there would be serious revolts against Roman rule - one in Britain and 2 in Judea were the most serious,so this policy didn't necessarily work everywhere all of the time.
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According to manifest destiny, that America should be able to obtain Texas as well as the Oregon country. O' Sullivan said that it was for the "free development of our yearly multiplying millions".