How did the bus boycott put pressure on the bus companies, and the government to end segregation?

The Montgomery Bus Boycott is a civil rights protest while African Americans stopped riding city buses in Montgomery Alabama to protest segregated seating Four days before that boycott began Rosa Parks a African American woman was also arrested then fined for refusing to stop her bus seat to a white man

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social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live

political parties are protected under 6th amendment.