Why did many blacks migrate to the great plains area?

Which factor was a major cause of the great depression of the 1930?

The first map shows colonial powers and their holdings (1945). the second map shows human development worldwide. compare the two maps. what do the maps indicate about regions that gained independence in the second half of the twentieth century? they differ in their development patterns. they are as developed as their colonial powers. they are more developed than their colonial powers. they remain less developed than their colonial powers.

Why did european nations face financial challenges after world war 1?