The United States of Europe is a name given to several similar hypothetical scenarios of the unification of Europe, as a single nation and a single federation of states, similar to the United States of America, both as projected by writers of speculative fiction and science fiction, and by political scientists, politicians, geographers, historians, and futurologists.
Napoleon is supposed to have said during his time on St. Helena ; “Europe thus divided into nationalities freely formed and free internally, peace between States would have become easier: the United States of Europe would become a possibility".
George Washington is thought to have written to the Marquis de La Fayette: "One day, on the model of the United States of America, a United States of Europe will come into being". After the American War of Independence the vision of a United States of Europe similar to the United States of America was shared by a few prominent Europeans, notably the Marquis de Lafayette and Tadeusz Kościuszko.
“United States of Europe” (États-Unis d´Europe) was also used by Victor Hugo, during a speech at the International Peace Congress held in Paris in 1849. Hugo favored the creation of "a supreme, sovereign senate, which will be to Europe what parliament is to England" and said, "a day will come when all nations on our continent will form a European brotherhood... a day will come when we shall see... the United States of America and the United States of Europe face to face, reaching out for each other across the seas".
Winston Churchill also called for United States of Europe in a speech at the University of Zürich in Switzerland, 1946.