"mussolini attacks ethiopia" (1935) "germany takes the rhineland back" (1936) "germany and soviet union divide poland" (1939) the headlines above might be used to illustrate the failure of which of the following? united nations warsaw pact congress of vienna league of nations

Which effect did the united states supreme court's decision in plessy v. ferguson have? 1. ending segregation in all public schools in america 2. protecting voting rights for african americans by eliminating literacy tests 3. upholding the rights of all citizens to be treated equally by the government 4. authorizing the system that kept black and white people separated