Why did monopolies come about?

5  Congress enacted it in 1890 when monopolies were trusts. A group of companies would form a trust to fix prices low enough to drive competitors out of business. Once they had a monopoly on the market, they would raise prices to regain their profit. His monopoly allowed him to control the price of oil.

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.