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The United States join the war against the Japanese forces.
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The United States Intervene to Stop communist North Korea from invading South Korea
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The United States intervenes to stop the communist North Vietnamese from invading the democratic South Vietnam
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The United States intervene to liberate Kuwait from Iraqi control
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The United States is attacked by terrorists. A few months later, the United States invades Afghanistan.
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The United States invades Iraq, to stop them from building WMDs