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B

Explanation:

B second answer

Explanation :The Truman Doctrine was an American foreign policy with the primary goal of containing Soviet geopolitical expansion during the Cold War. It was announced to Congress by President Harry S. Truman on March 12, 1947, and further developed on July 4, 1948, when he pledged to contain the communist uprisings in Greece and Turkey. Direct American military force was usually not involved, but Congress appropriated financial aid to support the economies and militaries of Greece and Turkey. More generally, the Truman Doctrine implied American support for other nations thought to be threatened by Soviet communism. The Truman Doctrine became the foundation of American foreign policy, and led, in 1949, to the formation of NATO, a military alliance that still exists. Historians often use Truman's speech to well what was the doctrine The doctrine, which had both economic and military elements, pledged support for countries attempting to hold back Soviet-style revolutionary Communism. It symbolized the United States' post- World War II global leadership role. Truman justified his request on two grounds. He argued that a Communist victory in the Greek Civil War would endanger the political stability of Turkey, which would undermine the political stability of the Middle East. This could not be allowed in light of the region’s immense strategic importance to U.S. national security.

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nuclear fission produces the atomic bomb, a weapon of mass destruction that uses power released by the splitting of atomic nuclei the fighting in iwo jima and okinawa affected the allies' pacific strategy because truman decided to drop the atomic bomb on mainland japan.