What question are you speaking of?
Answer:
Some were used for burial mounds , the presence of human remains would reveal that purpose.
Explanation:
B)
This is because as a result of the Emancipation Proclamation, the Union’s goal was now to free slaves along with preserving the Union. The slaves in the Southern states began to flee North toward freedom too. Lastly, the public in Europe supported the Union, so the leaders of those countries turned against the Confederate States.