"<span>New railroad lines across the Great Plains made it cheaper to ship cattle by rail" would be the best option, not only because of the reduced price, but because of the increased timing and efficiency. </span>
Coal-burning factories and increased automobile usage has caused the greatest increase in "<span>A) air pollution," since in fact coal when burned is one of the worst pollutants. </span>
<span>B. Announcement of the Marshall Plan I think</span>
Answer:
outskirts of Richmond I believe.