It was mainly developments in the "steel" industry that made important contributions to improvements in the transportation system in the United States during this time, since the major advancement in transportation was in the railroads, which were made from steel.
<span>the notion that power lies with the people <span>popular sovereignty</span></span>
Answer: c
Explanation: i don't know guessed thank you so much for question
Answer: So your answer here will be f. Checks and Balances
Explanation: To find the answer if you look up the definition of this phrase it is “counterbalancing influences by which an organization or system is regulated, typically those ensuring that political power is not concentrated in the hands of individuals or groups. By looking at this you find that the definition of this matches each branch of government has power over the others to ensure that one branch of government cannot yield more power than the rest.
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