Reinhart Koselleck showed that the decades around 1800 witnessed a major transformation of political language. Around 1800, the horizon of expectations gained distance from the space of the experiences that human beings were making, and thus possibilities for the future opened up widely. In particular, the future would be the time during which 'peoples' would gain their capacity for self-determination, called popular sovereignty. This would occur in two particular versions that crystallized in the course of the 19th century, namely as 'nations' that would unify or liberate themselves from monarchical and/or imperial domination to form the polities proper to them, or as a 'class' that embodied the universal interest of humankind and would assert itself in a second revolution, following up on the French Revolution. Political concepts acquired during that period the meaning that they still had in the late 20th century, i.e. the time when Koselleck developed his approach to the history of concepts, but they may be challenged in the present time, and with them the entire self-understanding of modern polities.