The ability to survive is crucial to a a civilization's continuity. Evolution basically means to adapt or perish. Only the strong (in every possible aspect) adapt, and with those strengths they become more resilient. Resilience is an advantage when dealing with adversities such as unforseen disasters. Once one experiences them, it becomes part of their resilience - at least for the survivors.
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The answer is (C)Rising middle classes demaned greater power in the government
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The Monroe Doctrine was an effort to stop Europeans from influencing politics within the United States. (Lets say if Russia tried to turn the U.S communist during the cold war. The Monroe Doctrine would take into effect)
<span>It set up a standardized system whereby settlers could purchase title to farmland in the undeveloped west.</span>