Answer:
rule of law
Explanation:
the principle that all people should be accountable to law that is fairly enforced.
Immigration was certainly a key factor in the growth of America's economy . The Industrial Revolution came with massive technological developments, and the chance to exponentially improve the production rate of factories. However, to operate these emerging industries it would take a tremendous amount of laborers. American citizens working alone, weren't going to be enough. In other words, the peak of immigration influx allowed the U.S. to take full advantage of the possibility at the right time.
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The Monroe Doctrine forbidden the European powers from colonizing in the additional lands in the Americas.
