system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do many biracial people such as black/white mix primarily identify as black when they are half black and half white?

I've always wondered this.

EDIT: Thanks for the discussion folks. There were some really good stories too. Not to mention only a few posts containing ignorance.  Most of the (thoughtful) answers centered around the same thing so I have pretty good idea of why people identify as black over white if they're biracial.
gpt
Because a dominantly white world here in the states creates a "white" and "other" social identity.  You are likely to identify as black when people _identify you_ as "not white" and black is the obvious "other" category into which you fit.  This is - of course - gross generalization.