Answer:
have fallen by more than one-half.
Explanation:
Thick, noticeable smog in many of the cities and manufacturing centers of the United States helped bring the 1970 e Clean Air Act to spur passage at the height of the national environmental movement. The ensuing modifications were intended to enhance its effectiveness and address newly recognized problems of air pollution such as acid rain and stratospheric ozone layer damage. The Clean Air Act allows EPA to set national environmental air quality levels for certain specific and prevalent contaminants, based on the latest research, to protect public health and welfare nationally. Certain main regulations are intended to reduce the rise in emissions from increasing motor vehicle numbers and new manufacturing plants.
Answer:
The reason can be attributed to the fact that if more states became free, then those states can easily overturn any southern legislation in government that aligned with their pro-slavery views and if more states became slave states, then the South would have a political advantage in the federal and state governments as this would mean more states would push for southern-aligned legislation.
Explanation:
the world war last tell 1945-1939 so the answer Will be D. six years
