The US constitution differs from the Articles of Confederation because of the power that the federal government has. In the articles, each state acted as it's own country. They had the ability to command a military, declare war, and tax terrifs against other states. The constitution has the states act as subordinates to the federal government. They have the right to tax citizens, but their power and their ability to interact with other countries are strictly regulated through the federal government.
For the answer to the question above.
The best answer I can give is letter B.
During the civil war, there was also a competition in the global market on the supply of cotton so Europe sought other suppliers from India and Egypt and this is why the price is down after 1865
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