Because racism doesn't coincide with an economic or government ideology. If that were the case, then AOC, Kamala Harris, or Ihlan Omar (and more) wouldn't hold office. The idea that Angela Davis expressed is now outdated
You can't have capitalism without a class of wage slaves. It's arbitrary that America uses race to differentiate. It could've been brown haired people, or women, instead.
I haven't read her work, so I can't comment on the second part. I'm curious if you know what her response to the above would be?
Oh you absolutely can have capitalism without racism
Only in a hypothetical society where the different races have equal financial and social conditions.
In the real world, dominant races, ethnicities, religions and classes will dominate and oppress the others if we let them.
Capitalism actively encourages them to through its fundamental ideology of resource hoarding being not just objectively good but the main goal of all economic activity.
So if I'm reading correctly this is a just "Capitalism is built on Racism, and we can't end Racism without ending Racial Capitalism." But stated in a more inflammatory way. Probably to draw attention.
The idea actually goes back to way before capitalism was officially invented. They use the word capital here in it's business meaning and only partially in it's ideological meaning. They point out that the idea of centralizing the control of land and capital goes back to feudal states and was the reason Europeans started deciding who was superior and who was inferior.
It's certainly a new way for me to look at the 100 years war and the Protestant/Catholic wars.