The late nineteenth-early twentieth century saw?

the rise of the middle class
the rise and dominance of the republican party
the need for a third political party
woodrow wilson switch from the republican party to the new democrats

The late nineteenth-early twentieth century saw the rise of the middle class. The correct option among all the options that are given in the question is the first option. This is the period in which the middle class started coming into the picture as a very strong force. I hope that this is the answer that has come to your help.

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The late nineteenth-early twentieth century saw?

the rise of the middle class