What event triggered mass migration to California in the mid 1800s? Why was this a problem?

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.

The most influential immigrant group in texas came from

Which governing principle is best reflected by the representative government created by the constitution a. separation of opwer b. republicanism c. rule of law d. limited government