Here's why:
* Peninsular Preference: The Spanish crown heavily favored sending Peninsulares (people born in Spain) to serve as viceroys. They were seen as more loyal to the crown and less likely to challenge Spanish authority.
* Limited Creole Representation: While some Creoles did hold high positions in colonial administration, they were generally excluded from the top positions like viceroyalties. This was due to the crown's fear of Creole independence movements and a desire to maintain tight control.
* Exceptions: There were a few exceptions, like the case of Antonio de Mendoza, who served as Viceroy of New Spain in the 16th century, and was Creole. However, these were rare occurrences.
In summary: While Creoles played important roles in colonial society, they were largely excluded from the highest positions of power, with the viceroyalties reserved for Peninsular officials.