Pakistanis,
Please, claim exclusive rights to "Indus valley civilization" history. we are more than happy to help you in claiming IVC.
For confused Pakistani expats wondering why IVC is associated with India rather than Pakistan: Ancient cultures are named after the place which it was discovered for the first time, a convention in modern archaeology. That's why IVC was named Harappan culture, which is in Pakistani Punjab. This culture is often referred to as a civilization because of its Population, areal extent, Urban Planning, knowledge of writing, arts like dance, painting, sculptures etc., One more important reason being the clear knowledge of it's evolution with times.
7000-5500 BC to 1300-300 BCE.
Pre-Early Harappan period(7000-3000 BCE), often associated with Mehrgarh, (present day Baluchistan) was a period of Food Producing (surplus to support a settled life) and a late Neolithic phase of this culture.
Early harappan Period(3300-2600 BCE) is often referred to as Ravi phase(after the river Ravi) was the next stage of the culture, studied or observed at Harappa, Punjab and other sites in Baluchistan.
Mature Harappan Period (2600-1900 BCE) is the actual "Civilization" that our Friend here wants to reclaim as Pakistani Civilisation. Unfortunately for him, it wasn't a stuck up/stagnant culture but an evolving one. This ancient culture evolved in to what we now refer to as Late Harappan culture.
Late Harappan Culture (1900-1300 BCE) is Painted grey ware culture leading up to the Iron Age of India along with the rest of the world. The period being 1300-600 BCE is often associated with the decline of IVC and early Iron Age India.
Iron Age India, Early Vedic Period, Decline of IVC all these are supposed have happened within the same period of Late Harappan culture.(1900-1300 BCE). Hence the Theory of Aryan Invasion was floated citing the texts of Rigveda, which was later modified to Aryan Migrations Theory, which is still under study.(Aryan, here is a linguistic group/ Groups).
Even Though the IVC urban centres were Harappa, Ganeriwala, Mohenjo-Daro in modern day Pakistan, and Dholavira, Kalibangan, Rakhigarhi, Rupar, and Lothal in modern day India, some smaller settlements in Afghanistan, Baluchistan, Turkmenistan, modern Day Geography wasn't the issue while studying ancient cultures and peoples.
But, India is generally considered as Classical Living Civilization, along with Ancient Greece, Ancient Chinese and this Civilization has it's roots in the interaction of IVC peoples and later Vedic Peoples(without or without Aryan Theories). Hence, Ancient India is associated with IVC and India as a civilization has it's roots in IVC. Hence, the association with India and not Pakistan.
PS Indoi name was used by greeks to refer to people living in Indus valley (and couldn't conquer beyond Indus), but the name India came to be used by the West borrowing from greek tradition to mean whole of sub continent , which BTW was seen by Chinese, Persian, Greek Travellers as a unique single entity just as the people, scholars and kings of ancient India.