The correct answer is A) The 15th Amendment.
After The Union had defeated The Confederacy, the right to vote was guaranteed to all races. This was possible because the Union was in favor of equality.
They would probably study a development of trade, Among others.
Mainly because Prussia did not have any natural frontiers for defense.
Hope this helps!!!
~BBGLUVER
Slaves in the U.S. were the only slave population to grow by natural reproduction
