Aryans, Greeks, Persians, and Mongols all succeeded in conquering all or part of India by attacking through the mountains. Who had the most influence on the culture of the Indian Subcontinent even today?

Aryans.

Explanation:

The Aryans, nomadic herders from Central Asia who had migrated into the Indian subcontinent by 1500 BCE, had already established a caste system with four main groups of people: brahmins, or priests; kshatriyas, or warriors and aristocrats; vaishyas, or peasants and merchants; and shudras, or serfs.

This separation of people by class and job gained an even bigger foothold within Hinduism: according to Hindu myth, the god Purusha was assembled from the four castes, with the Brahmins at the head and the Shudras at the feet. It was believed that shudras had been born into their caste because they committed bad deeds in a previous life, or incarnation. The Hindu ideal of karma suggested that people who behaved well could be born into a higher caste.