Yes Pakistan has only existed AS A STATE for almost 60 years but the Land of what is now Pakistan and the people that live in what is now Pakistan are descendants of the ancient people that lived there and people that came and invaded/integrated; The majority of people of Pakistan have lived on the land of Pakistan for thousands of years, Therefore they are the the decendants of a most cultured people; Indians on the other hand were living in the jungles, Besides you said so yourself The majority of people of Pakistan have lived on the land of Pakistan for thousands of years, Also Like I have said constantly Harappans, Rig Vedic Aryans, Persians, Greeks, Scythians, Parthians, Kushans, Hephthalites, Arabs, Turks, and Moguls have all played thier part in the history of what is now Pakistan. Indus valley does not even lie In India! Its in Pakistan, How dare you Indians claim Indus valley as your civilization!
India was only properly unified during the 1000 year Muslim rule, Before this point of time India was not a unified country but rather a large area of land made up of princely states, The integrated India that included Pakistan was adopted by the British when they took charge; Can you prove to me that Pakistan was part of India outwith 100 years of the Marrayans, 522 years of Muslims and 100 years of the British? Thats only for 700 years of Pakistans entire 3500 BC history.