What were two techniques entrepreneurs used to create monopolies

Horizontal and vertical integration.

Explanation:

The monopolies in America were created using both horizontal and vertical integration. Horizontal integration means that those powerful companies would buy other companies that were “weaker”, this would reduce competition. Vertical integration is when a company buys another company that operates one section of the supply chain. So the company controls the unit economics of the product and control the profit margin.

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abraham lincoln  (february 12, 1809  – april 15, 1865) was an american statesman, politician, and lawyer who served as the 16th  president of the united states  from 1861 until  his assassination  in april 1865. lincoln led the nation through the  american civil war, its bloodiest war and its greatest moral, constitutional, and political crisis.[2][3]  he preserved the  union,  abolished slavery, strengthened the  federal government, and modernized  the u.s. economy.