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

How did the house of wisdom contribute to social developments during the golden age

The political, economic, or cultural environment that surrounds an event provides the event with its

Ahistorian has discovered a letter written by an early roman emperor. she translates the letter and discovers that it contains orders to a general before a battle. she works to determine when the letter was written to figure out which battle the letter references.the historian in the passage is most clearly demonstrating which historical thinking skill? a. identifying causes and historical contextb. thinking chronologicallyc. making and evaluating arguments and interpretationsd. analyzing historical sources