In addition to speeding up the transportation of goods, the transportation revolution also contributed to the growth of
a
new cities across the country
b.
the slave trade in america
free public education
c
d
labor unions on the east coast.

D: Labor unions on the East coast. Soon, both railroads and canals crisscrossed the states, providing a transportation infrastructure that fueled the growth of American commerce. Indeed, the transportation revolution led to development in the coal, iron, and steel industries, providing many Americans with new job opportunities.

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