Why is latin America often called a melting pot?

As it has a vibrant culture that came about through the admixture of Native, African and Iberian cultures, it can be argued it's an unsegregated melting pot. Food, cooking methods, music, dances, religious takes, dialects and phenotypes are all, new offsprings of the "miscegenation" of the various cultures that came into contact with each other. That's probably why.