Short answers, pulled from the story.
A government ministry created the Northern Zonal Council to foster cooperation among states like Punjab, Haryana, and Delhi in 1956. This administrative body included eight specific regions under its advisory scope.
Another group formed by the Ministry of Culture established the North Culture Zone in Patiala, Punjab, on the 23rd of March 1985. That zone excluded Delhi but added Uttarakhand to its list of member states.
Qutub-ud-din Aibak declared independence from Central Asian nomadic clans in 1206 to establish the Sultanate of Delhi. This sultanate controlled much of North India for centuries while allowing non-Muslim subjects to follow their own laws.
Queen Victoria became Empress of India in 1877 when the Crown-ruled India formed a loose political union. Public life gradually emerged leading to the founding of the Indian National Congress in 1885.
Article 370 of the Constitution was revoked in 2019 changing Jammu and Kashmir status into two union territories. These administrative changes reshaped the political map of North India over decades.