Oh so thats where you get your history lessons from,
India was not under the control of one person as a Akhand Bharat ideology and several rulers were ruling different states and all the Rajas or the Emperors were fighting with each other for the expansion of their territory and this division itself portrays the false claims of Akhand Bharat. Even the Muslims could never say Akhand Muslim kind of word as they were also divided among themselves in the name of Sassanid Empire, Khilji, Mughals, Mysore, Hyderebad Daccan, Rajputs and not to forget the Sikh Empire that was established before the British Raj.
Several different smaller kingdoms were different countries in itself just like todays Pakistan and India and there was never a moment when an Emperor could keep a major control of Indian subcontinent under his Kingdom and we also must not forget these are only Kingdoms but during this period of thousands of years Indian subcontinent was further divided into different religions, languages, cultures, traditions, moral values, interests and so on. The list is never ending. Thats why I think perhaps all neighbours should invade and dismember india it wouldnt take china and pakistan alone more than a week or so to achieve this relativly quickly without too much bloodshed into maybe 30 or so countries. You cant force people to live together