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Pax Americana ( modeled after Pax Romana and Pax Britannica; also called the Long Peace) is a term applied to the concept of relative peace in the Western Hemisphere and later in the world after the end of World War II in 1945, when the United States became the world's dominant economic, cultural, and military power. In this sense, Pax Americana has come to describe the military and economic posit... Wikipedia