Spanish History In Mexico

Why do so many illegal Mexicans claim to be a kind of American Indian?
If that were the case, how can they explain where they got language and European culture, not to speak of their religion and family names? A handful of Spanish conquistadors hundreds of years ago to tie a Native butch and whip them, like the TV show "Roots" is wondering what his name again and again until, Garcia said instead of Montezuma? We know that Mexicans have at least fifty percent of European blood, so it is not self-hatred when they say Americans to "return to Europe?". Why Why deny your own history? Mexico was a colony of Spain for 300 years! And then 99% of all indigenous peoples were exterminated or married European families!
They believe that race is saying and it's all a bunch of bull. Mexicans also have African blood in his line, but he never says. They forget how the American Indians who fought for the land they inhabited, they forget the American Indians like Geronimo who fought against them. It's just bull spread racist by these groups.