Rubuta ci gaba don wannan sakin layi - A zaben shugaban kasa na 1912, Eugene V. Debs ya sami kashi 5.99% na kuri'un jama'a (jimlar kuri'u 901,551), yayin da jimlar kuri'un 913,693 a yakin neman zaben 1920, kodayake mafi ƙarancin kashi-kashi, ya kasance mafi girma ga dan takarar Jam'iyyar Socialist a Amurka. A Amurka, an kafa Jam'iyyar Kwaminis ta Amurka a 1919 daga tsoffin magoya bayan Jam'iyyar Socialist ta Amurka. Ofaya daga cikin waɗanda suka kafa, James Cannon, daga baya ya zama shugaban sojojin Trotskyist a wajen Tarayyar Soviet. Babban mawuyacin hali ya fara a Amurka a ranar Talata ta Talata, Oktoba 29, 1929. Yawan rashin aikin yi ya wuce 25%, farashin da kudaden shiga sun ragu da 20 zuwa 50%, amma bashin ya kasance a daidai adadin dala. Bankuna 9,000 sun gaza a cikin shekarun 1930s. A shekara ta 1933, masu ajiya sun ga dala biliyan 140 na ajiyarsu sun ɓace saboda faduwar bankin da ba shi da inshora. A 1921 ya faru da mafi girma da makamai, shirya tayar da kayar baya a cikin tarihin ma'aikata na Amurka: yakin Blair Mountain. Goma zuwa dubu goma sha biyar ma'adinan kwal sun yi tawaye a Yammacin Virginia, suna kai hari kan tsaunukan tsaunuka da kamfanonin kwal da sojojin sheriff na gida suka kafa. Ma'aikata da suka shirya kan yanayin da ke taɓarɓarewa da kuma 'yan gurguzu sun taka muhimmiyar rawa. A shekara ta 1934 Minneapolis Teamsters Strike jagorancin Trotskyist Kwaminisanci League of America, da West Coast waterfront yajin aiki
jagorancin Jam'iyyar Kwaminis ta Amurka, da kuma Toledo Auto-Lite ya jagoranci Jam'iyyar Ma'aikata ta Amurka, sun taka muhimmiyar rawa wajen kafa Majalisar Tarayyar Kungiyoyin Masana'antu (CIO) a Amurka.