What was the order of steps taken by the United States to clean the airway

enact the Clean Air Act, establish funding to study how to clean the air, create the EPA, and find cost-effective ways to keep the air clean

Explanation:

In America, the air act came as a first federal legislation to take care of air quality in 1963. Then the clean air fund was declared to tackle the problem of air pollution, promote decarbonisation and maintain human health.

The EPA act came in 1970 with the objective of setting national pollution standards. This act was further revised in 1986 to  protect human and environmental health.

separation of church and state? not sure what you mean.