After the new world was founded in 1493 by Christopher Columbus, the “two worlds” collided in a massive exchange of ideas, diseases, agriculture, animals, beliefs, and traditions. It really was like discovering an alien planet.
Naturally from the massive exchange of people, ethnicities started being mixed, babies were born half european and half native american. The word they used for this was, “Mestizos” which in spanish literally translates into the word, mixed.