What was the impact of cows and pigs on the american landscape?

How do you imagine life would be without the invention of the typewriter? would computers have been invented?

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.

What type of monarch was fredrick the great ?