If we never accepted slaves in the first place 13% of the population in America today would be non existent.
You can put a positive spin on absolutely any major tragedy in history. Doesn't mean it's justified.
They are the only race in the world that would never be able to catch up technology wise if it weren't for white people.
I'd argue that lots of African countries would have caught up at a similar rate to European countries had they not been colonized after the end of the industrial revolution. Equitable countries without racial disparities don't really form when
foreigners come in and completely take over your government. Likewise, when the
upper-crust of those countries leave and create a power-vacuum, you end up with power struggles and civil wars and a whole bunch of problems that hurt economic growth even more. Not to mention the colonial borders created by Europeans failed to take ethnic and cultural borders into account, which has created tons of ethnic conflicts that are extremely similar to the ones currently occurring in the Middle East.
And no, it's not because white people are better. There used to be huge, powerful African empires, and the Arabs used to be the source of humanity's greatest mathematical discoveries. But put both those regions through a century of colonization and you end up with the current situation, where loads of countries in Africa and the Middle East are violent hell-holes.
So if black people have any issues about how their ancestors were treated in the past, before their lifetime then maybe they should go back to africa.
So in summary, "If you don't like how white-government has forgeted up the place where you currently live, please move somewhere else, where white-government has also forgeted up that place too."