Argentines and Mexicans*
I don't get why you feel a need to just make stuff up.
Mexico, the American country with the largest indigenous population

Infografía: México, el país americano con más población indígena
Este gráfico muestra la cantidad de población indígena en una selección de países del continente americano y su proporción con respecto a la población total.
Anglos have a thing against Hispanics and against Mexicans in particular because they wanted to steal Mexico's land (and for white nationalist reasons) but that doesn't mean you have to adopt their stance.
this guy led a whole indigenous insurrection that stormed the capital and that the government had tons of difficulty fighting. you can't do that unless you have tons of indigenous population.
Latin countries with most white population would be
-Argentina
-Uruguay
-Chile
Mexico is mostly mestizo.