<span>John D. Rockefeller did everything by his own. Vertical integrations means that he employed his own workers, then he constructed barrels to store oil and rent wagons and horses to transport that barrels. So it's called vertical integration. </span>
Used the indian's land, fought with them and made them angry?
<span>to aid Panamanian rebellion against Colombia</span>
England was nations new world empire that provided them with economic supremacy
Answer: D. England
Hope this helped :)