Its literally just talking about the US here. There's no projection elsewhere - this isn't just "minority rights", this is attempting to break away from a culture of systematic oppression that half the country up until last month didn't believe was a thing!
The US is an immigration society where many white people from countries which weren't involved in US slavery and now they're all painted with the same brush. It's not reasonable for someone from say Russia to be attacked for the deeds of American slave drivers hundreds of years ago. And as far as I know white immigrants were strongly discriminated against in the US in the past two centuries.
A Russian who moved here in 1998 certainly didn’t have anything to do with racism. But he is participating in a society that claims to be a just one, in which he will get preferential treatment over a Black person just because the color of his skin. Is that his fault? No. Is it his moral responsibility as a participant in society to help create a more just society? Yes.
Then you're responsible for the climate problem, the extermination of native Americans, the Vietnamese death, the Iraqi deaths, etc... ? From what you preached you can only answer "yes" to all these. Then : what do you do to make amends for all those horrible crimes?
Other countries and people need not and should not accept sharing the blame for US sins against black people.