Final answer:
The Sherman Antitrust Act of 1890 was pivotal in preventing monopolies and promoting fair competition in the U.S. marketplace.
Explanation:
The Sherman Antitrust Act of 1890 was a crucial piece of legislation in U.S. history that aimed to prevent monopolies and preserve competition in the marketplace. This act prohibited contracts, combinations, and conspiracies that restrained trade, marking a significant step towards ensuring fair competition.
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