The British Empire had legalized slavery in their American colonies.
After the American Revolution, there was some effort to end slavery but it proved politically impossible, and so we retained slavery for a time.
In 1805 we banned the importation of slaves.
In 1861 - 1865 we fought a war which resulted in the defeat of slave owning states.
We amended our Constitution to end slavery.
We integrated the military.
We integrated baseball.
We passed the 1964 Civil Rights Act.
We elected a black man as president. Twice.
And STILL idiots like Danny Glover comes out and say, “Yeah, but back in 1822 ...”
So it’s hopeless. The chip will be on their shoulder forever. So why should I care what they think?
That's all wrapped up in a pretty little bow, but how do you account for the four Union slave states?