Compare the emergence of advanced civilizations in meso and south america with the four early river valley civilizations. how were the hohokam of north america and the ancient mesopotamians alike? a) both used irrigation. b)both existed at the same time. c)both lived in grasslands. d)both had a written language.

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