The 51st Congress of the United States convened from March 4, 1889, to March 4, 1891. It was a significant legislative session that included the House of Representatives and the Senate. During this period, the Congress addressed various issues, including economic policies and territorial expansion. One notable event was the admission of North Dakota, South Dakota, Montana, and Washington as states. The Congress also dealt with the Sherman Antitrust Act, which aimed to combat monopolies and promote fair competition. Overall, the 51st Congress played a crucial role in shaping the nation's laws and policies during the late 19th century.