6. Which reason best explains why the North developed an economy based on manufacturing, while the South focused more on agriculture?
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a. Physical geography supported different economies.
b. Northern plantations could not grow cotton.
C. Slavery was a necessity in both regions of the U. S.
d. Southerners lacked available land to build factories.
"Operations are made in one day with its aid, which could not be done in two to
four weeks by mail..."