As a result of the worldwide depression of the 1930s and the ideas of John Maynard Keynes many governments , including that of the United States , did what with their economies?

some american cities felt workers were being oppressed by business monopolies

b. ensure mutual protection from communism.

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monopolies  came to the united states with the colonial administration. the large-scale public works needed to make the new world hospitable to old world immigrants required large companies to carry them out. these companies were granted exclusive contracts for these works by the colonial administrators. even after the american revolution, many of these colonial holdovers still functioned due to the contracts and land

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the western roman empire flourished, but the eastern portion of the empire struggled.