Militarism has been a significant element of the imperialist or expansionist ideologies of many nations throughout history. Some notable cases include the Ancient Assyrian Empire, the Greek city state of Sparta, the Roman Empire, the Aztec nation, the Mongol Empire, the Kingdom of Prussia, the Habsburg/Habsburg-Lorraine Monarchies, the Ottoman Empire, the Empire of Japan, the Soviet Union, the United States of America, Nazi Germany, the Italian Empire during the rule of Benito Mussolini, the German Empire, the British Empire, and the First French Empire under Napoleon.