C The Cold War. Tensions were brewing up in the United States after World War II between the US and communist countries but in particular the Soviet Union. Many people were worried that were spies in government trying to gain classified government information.
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It means two chambers: it is used for legislative bodies, that is institutions that decide over a country's law. An example of a bicameral body is the US Congress, where the two chambers are: The House of Representatives and the Senate.