In the last decades, scholars have carved out Herder’s original and interconnected ideas about epistemology, metaphysics, philosophical anthropology, language, and aesthetics, situating his thinking in various strands of Enlightenment philosophy, natural history and hermeneutics. Several recent studies have also dissected Herder’s moral and political ideas. However, Herder’s views on modern European politics and the evolution of his political thought have remained largely unexplored. In particular, his self-avowed ‘German patriotism has not been studied at any depth. At the same time, a debate on Herder’s relationship to nationalism still lingers on. This study proposes that reconstructing Herder’s serial contributions to eighteenth-century discussions on the moral psychological foundations of, and the possible reforms in, modern societies provides a key to understanding the evolution of his political thought, including his relationship to nationalism. In engaging with thinkers such as Rousseau, Montesquieu, Möser, Ferguson, and Kant, Herder addressed questions on how to close the gap between moral principles and action, as well as law and ethics, in contemporary societies.