Anarchism in the United States began in the mid-19th century and started to grow in influence as it entered the American labor movements, growing an anarcho-communist current as well as gaining notoriety for violent propaganda of the deed and campaigning for diverse social reforms in the early 20th century. By around the start of the 20th century, the heyday of individualist anarchism had passed and anarcho-communism and other social anarchist currents emerged as the dominant anarchist tendency.
In the post-World War II era, anarchism regained influence through new developments such as anarcho-pacifism, the American New Left and the counterculture of the 1960s. Contemporary anarchism in the United States influenced and became influenced and renewed by developments both inside and outside the worldwide anarchist movement such as platformism, insurrectionary anarchism, the new social movements (anarcha-feminism, queer anarchism and green anarchism) and the alter-globalization movements. Within contemporary anarchism, the anti-capitalism of classical anarchism has remained prominent.