No other nation killed people the way the United States did to end slavery.

Slavery remained in the Deep South by other names - in prison programs with charges over nothing and eternal debt that threatened every African-American in the South right up through World War II. And that was after killing three-quarters of a million people, destroying cities, and creating hostility that exists to this day over the the Confederate flag and the racism it symbolizes, all brewing out of bitterness over a war that didn't have to happen.

Climate change is so unimaginable that most Americans deny it's happening.

The Pentagon is supposed to be under civilian control and it ought to be up to the people of the United States, not the profiteers.

I think the election of Donald Trump, if you want to call it an election, was unimaginable to most people, which is part of how it happened.

California, like anywhere else on Earth, should have the right to secede whether the United States likes it or not. The preferences of the other 49 states and Washington DC is not relevant. That was the position of the United States government on Yugoslavia and other places around the world but not on Ukraine. However, morality and the law as I understand it are that any people should have the right to leave, just as explained in the initial words of the US Declaration of Independence.

I think almost everything important that's ever happened was unimaginable shortly before it happened. Good things and bad things: ending slavery, ending child labor, women voting, etc.