why is there a spot for mexicans on the census and then a spot for whites if some

mexicans have white in them? I know some mexicans are white Spain, Germany, Italy, Portugal, and even Ireland conquered all of these. A mexican has half indigenous and white. Some fully white. Some with almost full indigenous I think it doesn't make sense because white people in the U.S. aren't even full white as well they also could have native american and blacdk as well. Also mexicans have black. This isn't really that back in history, probably just a mexicans great grandparents came from europe just as the same time the puritans and pilgrims came tyo the U.s.
 
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