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the answer is b ,that's my answer
Montgomery bus boycott, mass protest against the bus system of Montgomery, Alabama, by civil rights activists and their supporters that led to a 1956 U.S. Supreme Court decision declaring that Montgomery's segregation laws on buses were unconstitutional. The 381-day bus boycott also brought the Rev.(Britannica.com)
Answer:
A third of all banks failed. 1 Unemployment rose to 25%, and homelessness increased. 2 Housing prices plummeted 67%, international trade collapsed by 65%, and deflation soared above 10%.