The Green Party of the United States (GPUS) is a federation of Green state political parties in the United States. The party promotes green politics, specifically environmentalism; nonviolence; social justice; participatory democracy; grassroots democracy; anti-war; anti-racism; libertarian socialism and eco-socialism. On the political spectrum, the party is generally seen as left-wing.
The GPUS was founded in 2001 as the Association of State Green Parties (ASGP) split from the Greens/Green Party USA (G/GPUSA). After its founding, the GPUS soon became the primary national green organization in the country, surpassing the G/GPUSA, which was formed in 1991 out of the Green Committees of Correspondence (CoC), a collection of local green groups active since the year 1984. The ASGP, which formed in 1996, had increasingly distanced itself from the G/GPUSA in the late 1990s. John Rensenbrink and Howie Hawkins were co-founders of the Green Party.
The Greens gained widespread public attention during the 2000 presidential election, when the ticket composed of Ralph Nader and Winona LaDuke won 2.7% of the popular vote. Nader was accused by Democrats of spoiling the election for Al Gore. Nader maintains that he was not a spoiler in the 2000 election
The Party has been chaired by Thomas Duberry since 2019.