The document provides information about early civilizations in India. It describes the Indus Valley Civilization which arose around 2500 BC in the Indus River valley and established well-planned cities like Harappa and Mohenjo Daro. This civilization declined around 2000 BC for unknown reasons. It then discusses the Vedic period in India after 2000 BC, when the Aryans gained control. Vedic society was divided into four social classes called varnas, with the Brahmins as priests at the top.