What might caues somone metal map of a place to change

What might cause someone's mental map of a place to change? A mental map describes an individuals perception of features of earths surface, so things might have changed and places may have changed.

Explanation:

answer; /// i believe that the correct answer is (d)the huang he river valley;

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.