The inconvenient truth: ghetto blacks hate Mexicans, and ghetto Mexicans hate blacks. They despise each other. Their youth gangs seek to wipe each other out. This goes both ways.
It is difficult for the politically correct to understand, since both are designated victim/minority groups.
Yep I know several contractors and they know more about sociology than any dipstick full of Mommy Prof. BS, they say you can never ever mix the two groups on a crew, ever.
Gangs hat other gangs, period.