My top 5 "Darkest Moments in America History"

I mean there may have been "assignations," but they'd hardly count as darkest moments.

It might be a tough call.

When Yellowstone blew up and destroyed the Northern hemisphere.
Oh that hasn't happened yet?

A time-traveller walks into a bar.

...literally "owned" other people and considered them less than human by raping them, beating them, and treating them like animals. It's even sanctioned by the US constitution.

I was doing an all inclusive with that and the Civil War, but that is not accurate. Thanks for adding it.

Innumerable white riots against black communities that wiped them out, often killing many of them in the process.

Jim Crow

The attack on Fort Sumter.

Mexican American War

The internment camps of WWII

The War on (some) Drugs.

9/11?

but all lists are subjective.

the civil war and slavery into one thing. It may have been wrong not to separate them. But, it WAS what the civil war was fought over.

Ask somebody to rattle five things off the top of their head, it is interesting to see how the unconscious mind works. I would also say there's a lot of recency bias in your picks, i.e. events that happened during your lifetime. Vietnam, Kennedy, and Trump are all very important to people in a particular age group, but how does their broader impact stand up?