Answer:
The attack on the Pearl Harbor Naval Base by Japan.
Explanation:
After Japan launched their offence on Pearl Harbor, the United States became involved in the war. Before this, we were neutral and didn't want to be involved in the conflict. It was an act of pride by the young men who had enlisted.
Black code laws that reconstructed the Civil War
The main source of conflict at the Constitutional Convention was in regards to federal v. state power.
Federalists v. Anti-Federalists fought for weeks through published essays to push forward their view on whether their should be a strong Federal government or whether there should be a weak federal government to allow for strong and sovereign states.