It helped them find and attack German planes.
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Mayor Daley deployed thousands of police officers to restrain the protesters.
When the Democratic National Convention met in Chicago in 1968, thousands of protesters staged demonstrations against the US involvement in the Vietnam War. Chicago's mayor, Richard Daley, sent out 12,000 local police officers against the protesters and called in thousands more state and federal officers. The situation became a major riot between protesters and police that came to be known as "The Battle of Michigan Avenue."
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World War II the chief Allied powers were Great Britain, France (except during the German occupation, 1940–44), the Soviet Union (after its entry in June 1941), the United States (after its entry on December 8, 1941), and China. More generally, the Allies included all the wartime members of the United
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He did this to put an end to slavery.