“...indigious minority.”
Dark Mexicans ?
Los Indios.
The descendants of the Mayan and Aztec population (and several other Indian Nations) that lived in Mexico before the Spanish came.
There are several millions of Native Americans in Mexico who do not speak Spanish as their native language. Many do not speak Spanish at all.
They are at the bottom of the social order in Mexico. Mestizos (mixed Indian and European ancestry) are in the middle. The elites are mostly European-descended from Spanish, German, and Irish backgrounds.
The Mexicans that we see crossing the border are mostly from the Mestizo groups.
Yes that is what it is. They have been screwed over for years and is thus the basis of his support. Just like in Veneazuela this is. It will not end well.