Why does the united states regulate automobile manufacturing in so many ways?

The US regulates automobile manufacturing to offset air pollution.

Explanation:

Automobiles are a major source of air pollution. The smoke emitted by automobiles consists of a number of harmful gases that adversely affect the environment in a number of ways.  

If the manufacturing of automobiles is not regulated, increased production and use of automobiles will create greenhouse gases and contribute to global warming and climate change.  

well the fact it is basically a peninsula allowed trade to come from many places, thus allowing cultural diffusion to take place. india has seasonal monsoons that merchants travel back and forth from india using the monsoons wind patterns

answer; i believe that the correct answer is (tobacco);