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The Montgomery Bus Boycott was a political and social boycott, carried out between 1955 and 1956 in Montgomery, Alabama, to oppose the city's policy of racial segregation on public transportation. Many well-known people were involved in the movement, such as Martin Luther King Jr., Rosa Parks and others. The move caused high deficits in Montgomery's public transport system, as a large percentage of people using public transport stopped using it. The effort extended from December 1, 1955 to December 20, 1956 and led to a US Supreme Court decision declaring legal bus segregation requirements in the state of Alabama and Montgomery unconstitutional.