What was the casta system, and why was it created?

The casta system was the division among people that divided them into different parts of society depending on their ancestry, birth, colour and race. It was created by the Spanish elites to rank people socially depending on their race in Hispanic America. The casta system is not to be confused with the Hindu caste system, a system which is still in use today.

Is this a joke question or what, obviously that means red dead redemption 2!