System of social classes arose in india with the arrival of the

The system of social classes arose in India with the arrival of the Aryans. The term 'Aryan' was derived from a Sanskrit word which means 'noble'. Thus, they referred to themselves as those belonging to the more superior race. They were fair-skinned as they came from the northern region. They took control of the region, disregarding the culture of the natives. The social classes were the Kshatriyas or warriors, Brahmans or priests, Vaishyas or farmers and craftsmen, and the Sudra Varnas or the simple workers in the society. They was a struggle for power between the Kshatriyas and the Brahmans, but in the end, the Brahmans became the powerful leaders of the society they built. 

Spanish conquistadors demanded labour from natives.