The historic movement of upper-class and Caucasian populations out of US inner cities has been nicknamed?

White flight is the historic movement of upper class and Caucasian populations out of US inner cities has been nicknamed.

Explanation:

White flight is referred to as the sudden or large scale migration of people that is white people from various areas becoming diverse. White class population migrated during the Civil right movement during 1950s and 1960s. Cities that were involved were Detroit, Cleveland, Oakland and Kansas city.

Some of the historians suggest that white flight took place due to excessive population pressure due to large migration of the black people from the south that was rural in nature to the northern and western cities that was urban in nature.