How did the mechanical reaper and steel plow affect the efficiency of harvesting wheat in the great plains?

(05.04 mc) how did the roman transportation system keep the empire strong? plz

Which statement would most likely be made by an opponent of affirmative actions

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