Answer:
Slaves who were freed at the end of the Civil War.
Answer: The Battle of Fort Sumter (April 12–13, 1861) was the bombardment of Fort Sumter near Charleston, South Carolina by the South Carolina militia (the Confederate Army did not yet exist), and the return gunfire and subsequent surrender by the United States Army, that started the American Civil War.
Explanation:
It feared that Europe wanted to infringe on the newly gained US independence. They were afraid that European countries that were developed enough wanted to gain control of various portions of the American continent. This would limit the growth potential of the US as a country.
D. I believe Or it could be A.
They had a very bad agreement that's for sure