How is the clean air act in 1970 related to the principle established by the supreme court in the 1800's?

When was wheeled traffic permitted in early rome? daytime nighttime all day never

Which two activities did soldiers carry out as a part of their routine during the civil war? taking care of horses training slaves educating women cleaning weapons

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