1 14. In the last half of the 1800s, which development led to the
other three?
A expansion of the middle class
B growth of industrialization
C formation of trusts
D creation of labor unions

Growth of industrilization.

Explanation:

Growth of Industrialization.

Explanation: The Industrial Revolution is what caused the expansion of the middle class since low class individuals actually had jobs. It created labor unions because many people were complaining how bad the Working conditions were and were mad that machines were taking their jobs. And it created trusts because companies were growing largely

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