It was built around 2560 B.C
Kennan was an American diplomat in Russia and Truman advisor who believed the U.S. must contain, or stop, the expansion of the Soviet Union. ... The Truman Doctrine was a policy of containment because it called for providing direct aid to foreign countries resisting communism or communist threats.
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As it gained momentum, the abolitionist movement caused increasing friction between states in the North and the slave-owning South. Critics of abolition argued that it contradicted the U.S. Constitution, which left the option of slavery up to individual states.
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