What does speak softly and carry a big stick mean

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.

Why is it important that dr. luther king jr. use non-violent protest to create social change?

Plz . explain what shopping was like in london during the early 1900s. how does this differ from the modern shopping experience?