Answer:
to increase profits by minimizing competition
Step-by-step 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.