The mexican-american war of 1846 -1848 was justified in the opinions of many by
a. the monroe doctrine.
b. manifest destiny.
c. imperialism.
d. isolationism.

the answer is a. harriet tubman was a nurse on the battlefield.

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.