What 3rd party formed during the late 1800's?

Third parties have had a major influence on U. S. policy and political debate despite their minor presence in Congress - currently only one U. S. senator and one member of the House of Representatives is an independent.

In the late 1800s and early 1900s, the Socialists popularized the women's suffrage movement. They advocated for child labor laws in 1904 and, along with the Populist Party, introduced the notion of a 40-hour work week, which led to the Fair Labor Standards Act of 1938.