What was the main reason the united states government intervened in the great railroad strike of 1877?

D. the government considered railroads to be critical to national security and ended the strike for chiefly economic reasons

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explanation:

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.