Although race existed in British North American colonies, it was clearly defined and rigid. Spain’s colonies exemplified a more fluid social hierarchy because of the role of religious proselytization and the way Spain administered local and regional governments and economies.
During the Spanish colonization era in South America, Spain built settler colonies which entire families immigrated leading to less “mining” between Europeans native and slaves. It leads to a huge amount of mix of Europeans native and slaves exist in South America land which lead to a complex and fluid of social hierarchy.