Why did the region of sultans of dehli is said to have started from qutbuddin aibak?

Qutb al-Din Aibak (1150 - 1210) was a general of the Ghurid king Mu'izz ad-Din Muhammad Ghori. He was in-charge of the Ghurid territories in northern India, and after Mu'izz ad-Din's death, he became the ruler of an independent kingdom that evolved into the Delhi Sultanate ruled by the Mamluk dynasty

as general terms,  indian territory,  the indian territories, or  indian country  describe an evolving land area set aside by the  united states government  for the relocation of  native americans  who held  aboriginal title  to their land. in general, the tribes ceded land they occupied in exchange for  land grants  in 1803. the concept of an indian territory was an outcome of the 18th- and 19th-century policy of  indian removal. after the  civil war(1861–1865), the policy of the government was one of  assimilation.

monitor contract compliance and results of forestry activities to assure adherence to government regulations.  

plan and supervise forestry projects, such as determining the type, number and placement of trees to be planted, managing tree nurseries, thinning forest and monitoring growth of new seedlings.  

establish short- and long-term plans for management of forest lands and forest resources.  

determine methods of cutting and removing timber with minimum waste and environmental damage.  

supervise activities of other forestry workers.

by the way there is no video here.