1. Dred Scott v. Sandford
2. Bleeding Kansas
3. Missouri Compromise
4. Kansas-Nebraska Act
5. Compromise of 1850
Article I of the US Constitution puts this power in the hands of each State's legislature.
If you are interested in this topic, there is a fascinating development in this occurring in the Second Congressional District of Maine, which has adopted Ranked Choice Voting to determine its representatives. The loser of this year's election just sued in Federal Court to invalidate this as a way to hold an election.
The US reported 58 220 American casualties in the Vietnam war, although it may be higher. The causalities of North Vietnamese and Vietcong troops definitely exceed more than American casualties.
