Evaluate the positives and negatives of the increased use of gunpowder, cannons, and armed trade. Please add alot of detail, its for an AP WLD Hist. class.

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