So why do you not explain it? I don't doubt I can find numerous links that will pretend to support any leftist position, but I can never find a leftist (or a "centrist" such as yourself) that can ever actually explain anything.
Okay, 1800s
I was legal in Briton until 1834, France until 1848, Sweden 1847, Denmark 1848 etc.
Yes, abolishing slavery in the US was difficult, and it took the Republicans until 1865 to get it done.
Obama and Biden both won the popular vote.