Answer:
C - it outlawed the unsafe disposal of industrial waste
The Vietnam War showed the US people that the US wasn't the mightiest force on planet and that they were prone to losses as they eventually lsot the war. It created an anti-war sentiment and the American generation didn't want to partake in the actual war for that reason.
They found coal and iron and disciplined workers, a growing population, and a technologically advanced society with research.
