How did Standard Oil affect the U. S. economy as a whole during the Second Industrial Revolution?

A. By encouraging competition among small companies
B. By using profits to raise wages for refinery workers
C. By supporting government safety reforms in industry
D. By helping develop the country's infrastructure

In atleast 150 words evaluate the effectiveness of the presidential election process in the united states

Clara barton was the first nurse in the united states of america. true or false?

"neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the united states, or any place subject to their jurisdiction." - the thirteenth amendment to the united states constitution, 1865 which statement describes the effect that the thirteenth amendment had on american society? a) male freedmen were given the right to vote. b) slavery was made illegal in the united states. c) ex-slaves were given united states citizenship. d) southern states were no longer allowed to use convicts as labor.