The corrupt Spanish conquistadors are still in power in Mexico city and they want everyone in Mexico to think that has always been the case.
The people who run Mexico are all of White Spanish Descent, they tell the Chicano population that their problems are with the people who live in the USA of White European descent.
So you have a real case of Whitey in Mexico City playing race games with the populace of Mexico so they can stay in power by telling them to blame Whitey in the USA.