If you are referring to the United States, the answer is probably the Vietnam War.
I believe it is D....
Hope this helps
I think is A.......................
Answer:
d. The federal government over the states.
Explanation:
Following the end of the American civil war in May 1865, in which the Union won against the Confederates, the effects led to the power of the federal government over the states.
This is evident in the sense that the Confederates defeats truly proved the strength of the United States Government and reclaimed its legality to handle the issues bordering on all the states in the country such as the issue of slavery and giving Confederate States conditions upon which they must meet before joining the Union back.
