In a broad redefinition of U.S. strategic priorities, President Obama has said that the United States must revitalize its own economic, moral and innovative strength if it is to continue to lead the world.

Just as it did following World War II, the United States today must also shape a new international order and system of global institutions that reflect a 21st century reality in which "America's greatness is not assured," Obama says in a 52-page "National Security Strategy" released Thursday morning.

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