What was the effect of the Mexican-American war? Choose 2 answers.

A) it ended the conflict over the Oregon territory
B) It increased tensions between the North and the South
C) It resolved the argument over whether there should be slavery in the territories.
D) It proved a training ground for many generals later involved in the Civil War

B) It increased tensions between the North and the South

D) It proved a training ground for many generals later involved in the Civil War