OPEC was protesting because the U.S. was supporting the Israeli military leader during the Yom Kippur War.
So i imagine you mean the people that got free form the emancipation proclamation. What the emancipation did was say it was illegal for people to own any slaves. Former slaves didn't fully get to have equal rights until the 1900's. So in summary all it did was make it illegal to own slaves and the Confederacy of America had to accept that when trying to join back up with he The United States
I think the answer is a b and c
