Its D) because scientist focuses on how this happened and why.. so its D)
Basic Answer: In the late 1800s, workers organized unions to solve their problems. Their problems were low wages and unsafe working conditions. ... Exemplary Answer: In the late 1800s, workers organized unions to solve their problems. Their problems were low wages and unsafe working conditions.
The main reason why revolution swept so many African nations following their independence from European rule was because there was a giant power vacuum that needed to be filled--usually by a dictator.
The correct answer is letter C.
Explanation: The Democratic-Republican Party was the second political party created in the United States, having been founded in 1792 by Thomas Jefferson and his friend James Madison.