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What was a major cause of world war i?

What is political gerrymandering, what does is accomplish, and why might legislators use this tactic in redistricting

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