<span>The federal government pulled out troops from the South at the end of Reconstruction, leaving African Americans unprotected.</span>
In the constitution, you can found congressional powers regarding dealings with foreign relations in : C. Expressed
Expressed power refer to the power that is written in the constitution. You can find the written statement about this power in Article 1 of the United states Constitution
I think it would either be c or d but I would need the picture to be sure
I have no idea but you may look in a dictionary
