Answer:
They could have decreased protectionism. Protectionism means that they limited free trade between nations and restricted trade of foreign goods. Protectionism is widely accepted as maybe the biggest reason for the development of the Great Depression and thus if the US had decreased it, it most likely would not have happened at all.
Answer:
C) ratifying amendments to the Constitution.
Explanation:
All three of the others are federal government powers.
One. The Battle of Antietam.
The reason I say one is because the Confederacy has better War Generals, they had a more experienced militia. That’s why they were undefeated for so long. But The battle of Antietam of 1862 was the battle the Union, the North, celebrated because of their first victory against the Confederacy, the South.
It decided that the "once free always free" was no longer valid and did not need to be honored and Dred Scott and his family would remain slaves until freed by their masters. It became one of the main causes of the American Civil War.
Hope this helped!