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  1800s, American opened Japan to trade that called open door policy and alowed a system that trade to China to open equal trade for all country.
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  A warning to European power to stay out of the Western Hemisphere
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  1900, American has expanded across the continent and oversea, sought to expand its political influence as well
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  Important to have all nations in the Western Hemisphere unite in lieu of foreign aggression
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  United States pursued a policy of deterrence, building a military was strong enough to deter any direct attraction on American.
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  Mao meet us president Richard Nixon
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  The soviets invasion of Afghanistan in1979 led to US support of the anti communist rebel.
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  The US and it’s allies began the second gulf war in 2003. The goal is to spend the threat posed by Sadam Husseins
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  Donald trump signed document to increase the imports tax