C. Separation of powers although I guess it also ties in with checks and balances and the branches of the government
I think the mexican war where we took land from the mexico or the illiouisiana purchase
The correct answer is World War II
Following World War II, the United Nations were found with a goal of preventing such monstrosities in the future.
The North had its share of problems during the U.S Civil War. Late in the war, when victories are few and casualties are high, the Union employed conscription to alleviate manpower shortages. Of course, conscription did not proceed well and it did not sit well with the general public. There is so much evasion and resistance to the draft, leading to violent draft riots in New York.