What group invaded the indain subcontinent from the black sea area?
It was probably the Aryans, although many historians say it was not an invasion, but a migration of people from southern Russia and central Asia.
http://www.indhistory.com/aryan.html
http://adaniel.tripod.com/aryans.htm
http://encarta.msn.com/encyclopedia_761557562_10/India.html#p157