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Robert J. Oppenheimer was an American theoretical physicists. From 1939 - 1946 he was known for creating and doing research on an atomic bomb.
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The U.S made NATO and they wanted full countries to be in NATO,watch Oversimplified The Cold War for more info in a simple way hoped this helped
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Reform efforts during this time gave birth to a number of important changes in the United States and Great Britain. These included mandatory public education, child labor laws, and eight-hour workdays. Reforms also addressed minimum wage, compensation for workplace accidents, and improved sanitation infrastructure.
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The Cold War was a period of geopolitical tension between the Soviet Union and the United States
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In Dred Scott v. Sandford (argued 1856 -- decided 1857), the Supreme Court ruled that Americans of African descent, whether free or slave, were not American citizens and could not sue in federal court. The Court also ruled that Congress lacked power to ban slavery in the U.S. territories.
