The term "superpower" is somewhat subjective and may be used in different contexts. Traditionally, it has been used to refer to countries or states that have a dominant position in international affairs, typically characterised by a combination of economic, military, technological and cultural influence. Historically, the term "superpower" has most commonly been associated with two countries - the United States and the erstwhile Soviet Union, collectively known as the "superpowers" during the Cold War era. Other nations that have been considered or described as superpowers at various points in time include imperial China, the Roman Empire, Napoleonic France, Victorian Britain, Nazi Germany and Imperial Japan. However, there is no definitive or universally agreed-upon list of superpowers, and some people may consider additional countries or entities as worthy of that title based on certain criteria or perspectives.