Which of the following was not a long-term effect of the Mexican-American War?

C

Explanation:

Using experiences in another war means they use it once but not again, in addition all of the other changes had lasting effects, therefore, not accurate for the question asked

the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.

cultural history is your answer