The US acted before most of the globe did to do the right thing. Get over it
Denmark bans import of slaves into colonies in 1792. Unclear how extensive that was. Britain abolished the slave trade in 1807, the US in 1808. Britain abolished slavery in 1833. In US, emancipation of slaves in 1863, constitution amended 1865.
Problem is that people in the year 2020 will say that systemic racism is so widespread that it creates inequities towards African Americans.