African Americans migrated out of the U.S. South partly as a consequence of
A) the removal of travel visa requirements for people of color.
B) increased farm mechanization leading to a decreased demand for farm labor.
C) the development of better airports, allowing for rapid and efficient travel.
D) increasing opportunities to work in northern coal mines and the California gold rush.
E) the growth of agriculture in the U.S. North.
Answer: B
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