A lot of people think that all Mestizos need to be from south of the Rio Grande, while there wasn't much intermixing between Whites & Amerindians in the states, there was a mixing, it's common to see American mestizos in the reservations, many white americans claim amerindian ancestry, which is usually false, as DNA tests have proven that most White Americans don't have any Amerindian ancestry, most of the American Mestizos tend to identify with their amerindian side.