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The Monroe Doctrine stated that Europeans should not colonize in the Americas. It set up US foreign policy in the 1800s.
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The Chinese were angry because the British hooked the Chinese citizens. To protest,the Chinese tried to boycott opium, which lead to this war.
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The Japanese realized they had fallen so behind in technology when Matthew Perry arrived.
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The US was desperate to start this war, and it resulted in the US gaining Guam, the Phillipines, and Cuba.
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This is the beginning of a long multi-year struggle for power in Mexico.
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The Panama Canal allowed ships to go through Panama instead of having to go around South America.
