The main event that led the United State to take a more active role in the world affairs was World War II, since the US emerged from this war an economic superpower. It was also clear that some nation needed to "fill the void" left by the relative fall of the British Empire.
Answer: Passed by the 39 congress on March 2, 1867, it was used as the legal premise for impeaching President Andrew Johnson, whose Reconstruction policies were unpopular with the Radical Republicans in Congress. It was repealed in 1887 and declared unconstitutional by the Supreme Court in 1926.
https://www.history.com/topics/reconstruction/tenure-of-office-act
There you go.
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That would be True. They did indeed start a uprising