The Indian subcontinent has never been unified into a single empire; Asoka Maurya came close, but never united the entire south. Asoaka was a Buddhist emperor. India is regarded as a continent more then as a country. The Indus River valley was taken by the Aryanians, and eventually the Aryanians settles in the Ganges Valley. Political groups were called janapadas. Archaeology explains that the Ganges valley was not very accessible. Philology helps keep track of Indo-Aryanians by tracking the spread of their language. Written texts are also a good s…