4) What was one way business leaders tried to eliminate competition?​

Business leaders in the 1800s tried to eliminate competition by forming pools, trusts, monopolies, and through vertical and horizontal integration. Many companies organized pools to keep prices at a certain level, that is, they tried to keep prices from falling. Some companies formed trusts.

monopolies  came to the united states with the colonial administration. the large-scale public works needed to make the new world hospitable to old world immigrants required large companies to carry them out. these companies were granted exclusive contracts for these works by the colonial administrators. even after the american revolution, many of these colonial holdovers still functioned due to the contracts and land

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the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.