That would be the principal of federalism
Ans: The Industrial Revolution brought about sweeping changes in economic and social organization. These changes included a wider distribution of wealth and increased international trade. Managerial hierarchies also developed to oversee the division of labor.
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I guess I would say "C. an explosion with unknown causes" because he Maine explosion was likely caused by a fire that ignited its ammunition stocks.
The assumption before was that of Spanish sabotage but I guess we can never know.
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In the early 1930s, as the nation slid toward the depths of depression, the future of organized labor seemed bleak. ... The tremendous gains labor unions experienced in the 1930s resulted, in part, from the pro-union stance of the Roosevelt administration and from legislation enacted by Congress during the early New Deal.