Question

which region later became known as kush

Answer 1

As an Egyptian colony from the 16th century BC, Nubia ("Kush") was governed by an Egyptian Viceroy of Kush. With the disintegration of the New Kingdom around 1070 BC, Kush became an independent kingdom centered at Napata in modern northern Sudan.

Answer 2

Kush was a kingdom of Northern  America and was the  larger region 8000 BC