It is the poor who suffer. The majority of the poor are black and brown, yes. But it is the poor as a group who suffer and it is the poor, the majority of Americans, who must seize control of this country from the wealthy who seek to divide us into digestible chunks.
Poverty is a big part of it, but race is the beating heart of American injustice. Serwer makes this abundantly clear. Racism justifies and perpetuates class inequality, not the other way around.
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You are also playing into their hands. They want you to talk about race, don’t you understand what justification means? They point to the results of poverty as their proof that their racism is correct. Fix the root cause, poverty, and the rest of the problems will work themselves out. With no proof for the xenophobes to point to, there will be no hiding their xenophobia from scrutiny.