Answer:
In 1844, Congress finally agreed to annex Texas. On December 29, 1845, Texas entered the United States as a slave state, broadening the irrepressible differences in the United States over the issue of slavery and setting off the Mexican-American War.
Explanation:
Shi Huangdi
Hope that helps
I believe the answer is A, Pollution of the environment, hope this helps :)
My personal opinion would probably be a nurse. The reason being is even if I was not allowed to physically help out in the war, I would still feel like I was making a difference.