This article is an introduction to the first English edition of Karl Kautsky's article series "The American Worker" (Karl Kautsky, “Der amerikanische Arbeiter”, Die neue Zeit, 24. 1905-1906, 1. Bd., 1906, H. 21, S. 676-683, H. 22, S. 717-727, H. 23, S. 740-752, H. 24, S. 773-787), which was a Marxist reply to Werner Somart's book Why Is There No Socialism in the United States? (Werner Sombart, Warum gibt es in den Vereinigten Staaten keinen Sozialismus?, Tübingen: J.C.B. Mohr, 1906).