White Collar Jobs White-collar jobs expanded post-World War II because:
A. businesses were becoming more mechanized and complex.
B. the service industry expanded to meet the needs of the growing population.
C. companies wanted managers who had more education and training.
D. All of these choices are correct.

What would lead a historian to consider two events to have a relationship of correlation rather than causation?

Which of the following could affect the human population? a hurricane makes landfall on an uninhabited island. a deadly virus emerges that can pass from human to human. a civil war breaks out in italy. a solar eclipse occurs.

How was rockefeller able to build his monopoly across the oil industry? he found newer and cheaper ways to refine oil, increasing his profits. he confined his business to ohio so he could buy all the refineries there. he bought up oil refineries, cut costs, and reinvested his profits in other refineries. he began to sell kerosene as well as oil, expanding his market.