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The Monroe Doctraine stated that neither of the Americas could be conquered by the Europeans. Both Latin America and the US feared that they would be reconquered.
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The opium war was fought between china and the british becuase the british had been smuggling opium into china and 12 million people were addicted. The Chinese wanted it out of their country and went to war. Due to their old technology China lost.
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Commodore Mathew Perry from the US sailed to Tokyo with four ships and a letter from the President. This later resulted in the Treaty of Kanagawa
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US developed business holdings in Cuba and had economic stake in fate of the country, meanwhile spanish forced cuban citizens into concentration camps and US objected to brutality 1898 - US joined cuban war for independence, US attacked philippines and Spanish were not prepared and quickly collapsed. After the war cuba became a nation but US installed government and continued to controlled cuban affairs
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The Mexican Revolution started in 1910,and wasg led by Francisco Madero against Porfirio Díaz. Once the revolution wazs over, they created the Mexican Constitution of 1917.
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Columbia gave the US the panama canal thanking them for helping with their independence. The canal opened in 1914, and ships around the world used it. It became a crossroads of world trade and the US controlled it.