Main idea and 3 supporting facts

Which piece of legislation signed by lyndon johnson brought an end to barriers preventing minorities from participating in elections?

Why did some states believe they had the power to overturn federal laws?

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.