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Global events affect the United States.
Because the US was affraid that Latin American countries would become communist.
The Civil War encouraged industrial growth by challenging industries to make products more quickly and efficiently than they had been made before.
Americans became more involved in foreign affairs in the 1800s due to factors such as the desire for new markets for trade, the need for resources and raw materials for industrialization, and the pursuit of territorial expansion and strategic interests. Additionally, the United States sought to assert its influence globally and protect its national security by involving itself in international affairs.
capitalism
urban affairs, consumer affairs, environmental affairs, and employment practices
laissez faire capitalism
Europeans wanted U.S.resources, which led to rapid industrialization of the U.S.
The Roosevelt Corollary was an addition to the Monroe Doctrine. It stated that no European countries were allowed to intervene in Latin American affairs. The only way that the U.S was allowed to become involved was if the affairs or European countries was threatened. The United States could exercise police power in Latin America. The United States was the only country allowed to interfere with Latin American countries.
Isolationism is a policy of not being involved in world affairs. This means a country does not bother itself with worrying about the welfare of other countries.
America did get involved
Countries become industrialization of Britain by transcontinental railroad. This is what provided rail service from the Atlantic to the Pacific.