Another history question :(

About how many european immigrants were processed at the facilities on ellis island

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.

Describe the geography of the nile valley . how did this geography affect civilizations that emerged in the nile valley