What did the second industrial revolution combine?
a.
evolutionary and revolutionary socialism
c.
bourgeoisie and proletariat
b.
subways and streetcars
d.
industry and transportation

The correct answer is D) Industry and transportation.

The Second Industrial Revolution combined industry and transportation.

The first Industrial Revolution changed the way people produced goods with the integration of new machines in the fabrics. Basically, during the first Industrial Revolution, manufactured goods derived from raw materials and natural resources such as textiles. During the Second Industrial Revolution, things changed and the production was focused on the construction of railroads, better means of transportation, and the production of steel and oil.

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explanation:

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a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.