A. Slaves are people who were forcibly transported from Africa
to work on plantations
This is because American Natives were not slaves for long due to various laws and health issues
B. Peninsulares are people who came from Spain and held the most power
They came from the Iberian Peninsula which is where Spain is found, this basically means peninsula people.
C. Mullattos are people with one parent of Spanish descent and the
other an African American
These were people born mostly between Peninsulares who slept with their slaves
D. Mestizos are people with one parent of Spanish descent and the
other an American Indian
These were people who were born out of relationships between the natives and peninsulares.