Which of the following groups ranked highest in the spanish colonial caste system

This was also known as the sistema de castas. This was based on the purity of bloodline also called limpieza de sangre. The following groups were arranged according to the purity of blood and race mixtures based on the Spaniard's category known as mestizaje.

According to this, the whiter skin has more political, economic and social opportunities than the darker colored people.

These are some of the groups arranged in a descending manner from Spaniards, castizos, Moriscos, mestizos, mulattoes, Indians, and Africans. The highest according to them are the groups of the Spaniards.