This essay describes the main political, socioeconomic, and cultural dimensions of progressivism and, on this basis, explores the imprint of the Progressive Era on the modern United States. It pays particular attention to the transatlantic dimension of progressivism, suggesting that the reformers’ perceptions and translations of European social reform provided both inspiration and resources for the formulation of a new politics, economics, and culture in turn-of-the-century America, and arguing that the contributions of some German immigrant entrepreneurs need to be seen in this context. At the same time, the essay contends that the international dimension of progressivism highlighted the fissures, fault lines, and blind spots within the movement and within American culture and society as a whole.