Unlike socialist parties in Europe, Canada and Oceania, a major social democratic party never materialized in the United States and the socialist movement remains marginal, "almost unique in its powerlessness among the Western democracies".
Tidak seperti partai sosialis di Eropa, Kanada dan Oseania, partai sosial-demokrat tidak pernah muncul di Amerika Serikat dan pergerakan sosialis tetap terpinggirkan, "hampir unik dalam ketidakmampuannya di antara demokrasi Barat."