After the Civil War in America, the events which followed helped to usher in the:
- D. Second Industrial Revolution.
According to the given question, we are asked to state the events which followed helped to usher in a particular period after the Civil War in America.
As a result of this, we can see that after the American Civil War, there was a series of events which followed that helped to usher in the Second Industrial Revolution that brought in the production of goods with industrial machines.
Therefore, the correct answer is option D
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