British united India and intelligently partitioned to save Hindustan from the majority Muslim areas. Had it been otherwise, civil war condition is what we can expect. India never existed historically as one country but the same(similar) culture existed all the way from Burma to Eastern Afghanistan IINM. Many cultural and racial difference exists and that was tolerated. It was like Continental Europe much more so in diversity than the former. Ofcourse, Hindutva radicals will not like this truth as they are fed with this Akhand Bharat, Hindu domination ideologies.
RSS and Hindu Maha Sabha was sitting duck when Gandhi and Subhash Chandra Bose tried independently to gain freedom from Britain. Today, RSS is Hinduism and they are hell bend on re-innovating India as a "Hindu Pakistan".