Which of the following was an attempt to restrict a monopoly of the oil industry in the us?
dingley act of 1867
interstate commerce commission
sherman antitrust act
mckinley tariff of 1890

Sherman antitrust act

Explanation:

The Sherman Antitrust Act was a law passed in the United States that made trusts illegal, this meant that this little associations by different companies that united formed a gigantic corporation and that bascially created a monopoly in the oil industry had to sell their partitions and with that increase the competitiveness. This was a direct attack on Standar Oil and the American Tobbacco company.

a revolutionary war veteran

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.