Which statement is NOT true of the internal migration of African Americans in the United States since 1865?

Most African Americans migrated out of the South along early major roadways.
In the second half of the twentieth century, inner-city ghettos expanded to the outer city in major metropolitan areas.
Industrial booms in Northern cities were pull factors for African Americans living in the South.
Some real-estate agents used blockbusting to push African Americans out of neighborhoods.
Today, African Americans are highly clustered in urban areas.