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.

Explanation:

after losing to mckinley, bryan ran for president twice more.

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the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.