The Fifty-First Congress of the United States convened from 1889 to 1891. It was made up of the Senate and the House of Representatives, with a total of 332 members. This Congress was notable for its focus on issues such as tariffs, civil service reform, and the regulation of railroads. During this period, the Republican Party held a majority in both chambers, and Benjamin Harrison served as the President. Key legislation included the McKinley Tariff, which raised tariffs on imports, and the Sherman Antitrust Act, aimed at curbing monopolies and promoting competition.