7 Which factor contributed to the growth of the middle class in the late 1800s?
O A. Large numbers of middle-class immigrants came to the United States from Europe and Asia.
ов. Industrialization and the rise of large corporations created a need for more salaried professional workers.
O c. Political machines used their influence to raise the standard of living in urban neighborhoods.
OD. Factory wages increased rapidly due to progressive legislation and created upward mobility for many in the working class.
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B

Explanation:

The 1800s was a monumental period in regards to industrialization. Factories, especially textile factories, boomed in popularity, which inevitably resulted in a demand for labor. Therefore, the growth of the middle class in the late 1800's is most directly contributed to by the rise of industrialization and large corporations

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