Excuse me, not all, not even most, “latinos” are mestizos.
True, although the preponderance of those arriving in Southern California from Mexico and Central America may well be.
My Spanish-speaking church congregation includes people who are obviously Maya or Aztec, among the Mexicans: they look just like the carvings. We have Peruvians with distinctive Inca features. Colombians, Argentinians, and Puerto Ricans, along with some of the Mexicans, often look like undifferentiated "white" Americans; often more tan than I am, but not more than those of my children who picked up the Cherokee skin tone from their dad. Panamanians and Cubans can appear pure European, or be black.
Well, I don’t know about Puerto Rico or other nearby islands, but the people of South and Central America are a mix of Amerindians and Europeans from Spain/Portugal.
The term for this mix is Mestizo, and it comes in varying degrees of mixture. The African mix that comes from the slave trade on the islands is something else altogether.