Indus Valley Civilization is one of the original four ancient civilizations - Egyptian, Mesopotamian, Chinese, and Indus Valley.
Indus Valley is not India, and India is not Indus Valley. They are unrelated. The word India does not come from Indus Valley Civilization as popularly believed. India is a word used by European explorers for all natives: American Indians, Mayan Indians etc. They also used it for all lands they found e.g. West Indies and East Indies.
India is a 77 year old 'Soft State' (Bernard D. Nossiter, 1970) that was created by the British when they left South Asia in 1947. They bunched together heterogenous groups into the British Empire. Ethnicity, cultures, religion, mattered less to the British interested only in resources and market for its goods.
The historic and correct name for what is ‘India’ today is 'Hind' or 'Hindustan' (stan means land) for its Hindu religion and culture. Indus Valley is a distinct 3000 years old civilization with its own completely different culture, ethnicity, values, religion, mindset, food, language, and history.
Sikh religion is the only home-grown native philosophy of the people of Indus Valley Civilization.
The city of Sirhind (head or gateway/frontier of Hind) was demarcation between the Indus Valley Civilization and Hind/Hindustan. Sirhind has now been renamed to Fatehgarh Sahib as it was conquered (fateh) by the Sikh General Banda Singh Bahadar on May 1710.
Indus Valley Civilization and India have nothing in common. They have as much in common as bear and beer. In short, nothing in common.
Sikhs are descendants of the ancient 3000+ year old Indus Valley Civilization and Sikh religion is the only home grown philosophy of the civilization.
What is referred to partition of India in 1947 was the partition of the Indus Valley Civilization. Western part was absorbed by Pakistan as Panjab. Eastern part was absorbed by Hind/Hindustan into India as Punjab.