Answer:
shutting down the slave trade
Explanation:
During the thirty years leading up to the Civil War, anti-slavery organizations proliferated, and became increasingly effective in their methods of resistance. As the century progressed, branches of the abolitionistmovement became more radical, calling for the immediate end of slavery.
Ok, so that there is a bunch of stuff. There is evidence that President Roosevelt knew there would be an attack on Pearl harbor, but he decided to let it happen so that the US would be in on the war (we were not before the attack).
There's not a straight forward answer, but I hoped this helped!
The correct answer is C :)
