Until 1992 the goal of a “United States of Europe” was explicitly part of the CDU’s manifesto, while as early as 1925 the SPD had included it in their Heidelberg Programme, which remained in force until 1959.
Saksamaa Sotsiaaldemokraatlik Partei (Sozialdemokratische Partei Deutschlands, SPD) oli võtnud selle nõudmise juba 1925. aastal oma Heidelbergi programmi, mis kehtis kuni 1959. aastani.