Via Tumblr, an article at the International Socialist Review on the origins of racism in capitalist-driven slavery. The article tackles a few misconceptions:
1) That Marx's analysis was only about class and ignores race. (I've been guilty of assuming this, having read bits and pieces of his writing.) Marx very insightfully pointed out the links between racial division and capitalist accumulation.
2) That racism has always existed. And is natural. (It is not.)
3) That slavery in Africa and ancient Greece can be compared to U.S. slavery. (The basis and conditions of slavery in Africa and ancient Greece were very different.)
4) Racism ended after slavery was abolished. (Look, I get that facts make you feel guilty, but telling black people to "get over it, slavery was 200 years ago" is highly counter-productive. And racist.)
5) Multiracial spaces automatically promote racial equality. (Not really, for a variety of reasons.)
If anything, reading this should remind us that just thinking we're not racist isn't good enough; we have to be actively anti-racist in what we do and say, and even how we think. We need to keep listening to these stories of racism and heed them. We need to keep interrogating any knee-jerk "but I'm not racist!" reactions we may have.