Discuss the portrait of society provided by the Indian caste system

Please provide the best answer for the statement.

The ideal response would include the following:
Sometime around 1500 BCE the Aryans, nomads from the north, invaded the Indus River valley and conquered its inhabitants, making them slaves. Thus began the Indian caste system. By the beginning of the first millennium BCE, these castes consisted of five principal groups, based on occupation: At the bottom was a group considered “untouchable,” people so scorned by society that they were not even considered a caste. Next in line were the Shudras, unskilled workers. Then came the Vaishyas, artisans and merchants. They were followed by the Kshatriyas, rulers and warriors. At the highest level were the Brahmins, priests and scholars. The social castes were sanctioned by the religion the Aryans brought with them, which was based on a set of sacred hymns called the Vedas.