The response is: D)railroad
Low taxes, few government regulations and copetition encouraged people to invest in new industries.
Interestingly, the central government ventured in to enable specialists in a work to debate. President Theodore Roosevelt wound up plainly included and set up a reality discovering commission that suspended the strike. The strike never continued, as the mine workers got a 10% wage increment and diminished workdays from ten to nine hours; the proprietors got a higher cost for coal and did not perceive the exchange union as a dealing operator. It was the primary work debate in which the US government mediated as an unbiased authority.
The empire grew weaker because of military conflicts.
C)Veto a law.
With checks and balances, the executive branch of government can veto legislation.