The document summarizes the history and culture of India over 4000 years. It describes the ancient Indus Valley Civilization and its large cities with advanced sewer systems. It then discusses the decline of this civilization around 1900 BC possibly due to invasion, weather changes, or a combination. Subsequent empires that ruled India included the Mauryan, Gupta, and Mughal empires. Britain gained control of India through the East India Company and ruled until independence led by Gandhi and his advocacy of nonviolent civil disobedience. India was partitioned in 1947 along religious lines into India and Pakistan, resulting in violence and mass migration. The modern democratic republic of India has a federal parliamentary government and a large population