Answer:
In his 1959 book Man, the State, and War he explains the causes of war by distinguishing three levels (or “images”): the individual, the state, and the international system. On each level can be found causes that lead to international conflict.
The first major labor union was founded in 1866 by William Sylvis. It was called the National Labor Union (NLU).
It was the first national federation in the United States but it did not last. It dissolved in 1873. However, it paved the way for other labor unions and organizations.