What important contributions did the business pioneers of the late 1800’s make american to economic life?

The important contributions that the business pioneers had made in the American in their economic life in the late 1800’s,  they were able to provide a wide economic gap between two parties in their economic life such as these were the people of who are rich and those who are poor.

architecture i think.

i hope this !

worcester v. georgia, legal case in which the u.s. supreme court on march 3, 1832, held (5–1) that the states did not have the right to impose regulations on native american land. andrew jackson refused to enforce the ruling, the decision form the basis for most subsequent indian law in the united states.