What was the core business that made standard oil it horizontally integrated monopoly

In ww1 where did france find laborers to with their war movement? ? & what country did the french fear?

In order to get a consensus between anti-federalists and federalist to be able to forward on the constitution, james madison advocated for a bill of rights. what was the purpose of the bill of rights for citizens of the united states?

What are the 6 steps in the scientific method