Beginning with a small oil refinery this mans standard oil began to put competitors out of business who was he andrew carnegie j. p. morgan john d. rockefeller

He was John D. Rockefeller.

John D. Rockefeller.

Explanation:

The other options were also among the richest men in the United States but, in the case of Andrew Carnegie, he made his fortune with the Steel industry. While J. P. Morgan was a financier.

John D. Rockefeller started the Standard Oil company in 1870 on Ohio and the corporation grew to be one of the most important monopolies of the entire history until the United States Supreme Court regulated the monopolies on a case against Standard Oil in 1911.

I hope this answer helps you.

i believe it d) heterogeneous

regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.