Foreign Policy since treaty's do deal with other nations but usually after tensions or conflicts, embargo is a part of trade so for instant an embargo tax, and trade section has to deal with embargo's so the best choice is Foreign Policy.
Answer: Its the third option The United States Colored Troops Regiments
Hope it helps :)
The answer is C. Capitalism.
The answer is A.1866. 1965 is the most famous one but 1866 was the first