The Saraswati Sindhu - The 4.2 Kilo Year Event

The 4.2 kilo year event was a major period of drought in Western India, where the Saraswati River used to meet the sea. People were forced to migrate out of the region and these migrations most likely started around this time. And it's around this time also that you have various other things happening which indicate Indian presence far west of India. So yes, it was definitely a crucial factor in a complete reconfiguration of society and life in the Indian subcontinent and in various parts of the world.