Mexicans did not come from some where else. They have been living here for 23,000 years. Do not confuse "Mexicans" with the "Spanish", who were the conquistadors and not Mexican. "Indios" simply refers to Mexicans who have darker skin, many of whom do not speak Spanish, but instead speak their native tribal languages like Nahuatl. Some areas of Mexico, such as Oaxaca, have a huge Indian population that speak predominantly their native language...in fact many do not speak Spanish. THIS is where their bias towards them comes from. It should sound familiar. It is the same bias put forth by you and all others who insist anyone coming here speak English, is it not? The thing is, collectively the people of Mexico know this is wrong, and have been trying to change the public perception of "Indios", whereas people like you are trying to do the opposite. As for the Clovis people, The most commonly held perspective on the end of the Clovis culture is that a decline in the availability of megafauna, such as Mamoth and the like, combined with an overall increase in a less mobile population, led to local differentiation of lithic and cultural traditions across the Americas. And the Clovis were not in Mexico, they were spread across the Americas.