Why did business leaders of the late 1800's form monopolies and trusts? to increase profits by minimizing competition
to promote fair business practices in the marketplace
to allow the government better control over businesses
To protect the safety and rights of factory workers

to increase profits by minimizing competition

Explanation:

In late 1800s, United States still hasn't passed any particular low that prohibited the practice of monopoly. Because of this, big corporations at that time tend to find ways to do it in order to take complete control of the market that they're in.

One of the tactics that they often did was Buying out all the companies in the similar market.  This will ensure that there will be no competitors that can become a second option for the consumers even if they put a high price on the market.

the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.

general allotment act (dawes act) february 8, 1887

amendment to the dawes act, february 28, 1891

commission to the five civilized tribes (dawes commission), march 3, 1893