What was the annexation of Texas
A) Texas being kicked out of the United States
B) Texas becoming the 28th state of the United States
C) Texas becoming a independent country
D) Texas joining Mexico

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.