India country profile: . . . extensive urbanization and trade appear to have begun in the Indus River Valley around 3000 B.C. with the Harappan civilization. From this period until the termination of British colonial rule in 1947, numerous empires ruled various portions of South Asia, often assimilating a rich array of peoples and each adding its own contribution to an increasingly rich tapestry of cultures, ideas, and technologies.
India profile BBC
U.S. veteran oral histories (service in India)
India Constitution 1950
More India primary sources from the World Digital Library