Answer:
Amy Coney Barrett was appointed by President Donald Trump in 2020.
Apartheid left a huge cultural difference among the Africans. Despite being united, they were culturally aprt. This led to various civil wars.
A. Violent attacks form the Eastern tribes even led to the downfall of Rome, as soon as the mongols got to Rome they had no challenge in defeating such a weak nation in it's decline.
I am not going to answer in a paragraph of 125 words, but I will give you the answer to the first question; The United States didn't want another country to fall to communism. They officially got involved after the attack of the Gulf of Tonkin (U.S destroyers were stationed there and a radio came in that said they had been fired upon by North Vietnamese forces). (45 words BTW).
Answer:
I think it might be A or D if I'm wrong I'm sorry