Because they owned every step of the process to make steel like for example they owned the mines to mine the iron. Then they would own a 2nd mine to mine the coal for the steel. Then they would own the factories to make the steal. That is a vertical monopoly so for shorting your answer you can say they owned the mines and the factories to make the steel.
Its population has increased
This is false. The Constitution was ratified in 1788 (the first state ratified it already in 1787, Dezember 9th.
Slavery was outlawed only in 1865, with the Thirteenth Amendment
Answer: The answer is the third one.
Explanation: