Over the last few years, much attention has been devoted to the phenomenon of homegrown jihadist networks in the West. Most analyses have been based on the dual assumption that this phenomenon has manifested itself only extremely recently and that it is largely limited to Europe. While these two assertions are not completely unfounded, they do not take into consideration significant anecdotal evidence pointing to a long history of homegrown networks inspired by radical Islam operating within the United States. After an extensive overview of such history, the article analyzes the phenomenon of radicalization in America in comparison to Europe and the evolution of U.S. authorities' reaction to it.