Review the diagram concerning technological developments of the late eighteenth and early nineteenth centuries and answer the question.

Cause. 1797, Eli Whitney popularizes the use of interchangeable parts. 1807, Robert Fulton develops the first successful steamboat. 1837, Thomas Devenport creates a motor to power shop machinery. 1846 Elias Howe patents the first practical sewing machine. There is an arrow pointing to an Effect box with a question mark inside.

How did these developments affect the United States?

A.
Populations in cities in the North decreased as the nation's industrial economy declined.

B.
Populations in rural areas of the South decreased as the nation's industrial economy declined.

C.
Populations in rural areas of the South increased as the nation's industrial economy grew.

D.
Populations in cities in the North increased as the nation's industrial economy grew.