A superpower is a state with a dominant position characterized by its extensive ability to exert influence or project power on a global scale. This is done through the combined-means of economic, military, technological and cultural strength as well as diplomatic and soft power influence. Traditionally, superpowers are preeminent among the great powers.
The term was first applied post World War II to the United States and the Soviet Union. For the duration of the Cold War, the United States and the Soviet Union dominated world affairs. At the end of the Cold War and the dissolution of the Soviet Union in 1991, only the United States appeared to be a superpower. Alice Lyman Miller defines a superpower as "a country that has the capacity to project dominating power and influence anywhere in the world, and sometimes, in more than one region of the globe at a time, and so may plausibly attain the status of global hegemony". In the 21st century China has been described as a superpower.
No agreed definition of what is a superpower exists and may differ between sources. However, a fundamental characteristic that is consistent with all definitions of a superpower is a nation or state that has mastered the seven dimensions of state power, namely geography, population, economy, resources, military, diplomacy and national identity.
The term was first used to describe nations with greater than great power status as early as 1944, but only gained its specific meaning with regard to the United States and the Soviet Union after World War II. This was because the United States and the Soviet Union had proved themselves to be capable of casting great influence in global politics and military dominance. The term in its current political meaning was coined by Dutch-American geostrategist Nicholas Spykman in a series of lectures in 1943 about the potential shape of a new post-war world order. This formed the foundation for the book The Geography of the Peace, which referred primarily to the unmatched maritime global supremacy of the British Empire and United States as essential for peace and prosperity in the world.
A year later in 1944, William T. R. Fox, an American foreign policy professor, elaborated on the concept in the book which spoke of the global reach of a super-empowered nation. Fox used the word superpower to identify a new category of power able to occupy the highest status in a world in which—as the war then raging demonstrated—states could challenge and fight each other on a global scale. According to him, at that moment there were three states that were superpowers, namely the United States, the Soviet Union and the United Kingdom. The British Empire was the most extensive empire in world history and considered the foremost great power, holding sway over 25% of the world's population and controlling about 25% of the Earth's total land area, while the United States and the Soviet Union grew in power before and during World War II.The Superpowers: The United States, Britain and the Soviet Union — Their Responsibility for Peace
According to Lyman Miller, "[t]he basic components of superpower stature may be measured along four axes of power: military, economic, political, and cultural (or what political scientist Joseph Nye has termed "soft power")".
In the opinion of Kim Richard Nossal of Queen's University in Canada, "generally this term was used to signify a political community that occupied a continental-sized landmass, had a sizable population (relative at least to other major powers); a superordinate economic capacity, including ample indigenous supplies of food and natural resources; enjoyed a high degree of non-dependence on international intercourse; and, most importantly, had a well-developed nuclear capacity (eventually normally defined as second strike capability)".
In the opinion of Professor Paul Dukes, "a superpower must be able to conduct a global strategy including the possibility of destroying the world; to command vast economic potential and influence; and to present a universal ideology". Although "many modifications may be made to this basic definition". According to Professor June Teufel Dreyer, "[a] superpower must be able to project its power, soft and hard, globally". In his book , Dr. Ian Bremmer, president of the Eurasia Group, argues that a superpower is "a country that can exert enough military, political, and economic power to persuade nations in every region of the world to take important actions they would not otherwise take".
There have been many attempts by historians to apply the term superpower retrospectively and sometimes very loosely, to a variety of entities in the past. Recognition by historians of these older states as superpowers may focus on various superlative traits exhibited by them. Examples of these ancient or historical superpowers include the British Empire, Ancient Egypt, the Hittite Empire, the Median Empire, the Achaemenid Empire, the Parthian Empire, the Sassanian Empire, the Safavid Empire, the Afsharid Empire, the Hellenistic Empire of Alexander the Great, the Roman Empire, the Maurya Empire, the Byzantine Empire, the Bulgarian Empire, the Russian Empire, the Han Empire, the Tang Empire, the Rashidun Caliphate, the Umayyad Caliphate, the Abbasid Caliphate, the Mongol Empire, the Ottoman Empire, the Spanish Empire, the Timurid Empire of Timur the Great, the First French Empire of Napoleon, Song dynasty, Ming dynasty, Qing dynasty, Gupta Empire, Chola dynasty, the Delhi Sultanate, Bengal Sultanate, Rashtrakuta dynasty, the Mughal Empire, Kingdom of Mysore, Carthaginian Empire, Aksumite Empire, Almoravid Empire, Mali Empire, Inca Empire, Carolingian Empire, Holy Roman Empire and the Portuguese Empire. According to historical statistics and research from the OECD, Western Europe, China, and India accounted for roughly 2⁄3 of the world's GDP until the early modern period.
The 1956 Suez Crisis suggested that Britain, financially weakened by two world wars, could not then pursue its foreign policy objectives on an equal footing with the new superpowers without sacrificing convertibility of its reserve currency as a central goal of policy. As the majority of World War II had been fought far from its national boundaries, the United States had not suffered the industrial destruction nor massive civilian casualties that marked the wartime situation of the countries in Europe or Asia. The war had reinforced the position of the United States as the world's largest long-term creditor nation and its principal supplier of goods; moreover it had built up a strong industrial and technological infrastructure that had greatly advanced its military strength into a primary position on the global stage. Despite attempts to create multinational coalitions or legislative bodies (such as the United Nations), it became increasingly clear that the superpowers had very different visions about what the post-war world ought to look like and after the withdrawal of British aid to Greece in 1947 the United States took the lead in containing Soviet expansion in the Cold War.
The two countries opposed each other ideologically, politically, militarily, and economically. The Soviet Union promoted the ideology of Marxism–Leninism, planned economy and a one-party state whilst the United States promoted the ideologies of liberal democracy and the free market in a capitalist market economy. This was reflected in the Warsaw Pact and NATO military alliances, respectively, as most of Europe became aligned with either the United States or the Soviet Union. These alliances implied that these two nations were part of an emerging bipolar world, in contrast with a previously multipolar world.
The idea that the Cold War period revolved around only two blocs, or even only two nations, has been challenged by some scholars in the post–Cold War era, who have noted that the bipolar world only exists if one ignores all of the various movements and conflicts that occurred without influence from either of the two superpowers. Additionally, much of the conflict between the superpowers was fought in proxy wars which more often than not involved issues more complex than the standard Cold War oppositions.
After the Soviet Union disintegrated in the early 1990s, the term hyperpower began to be applied to the United States as the sole remaining superpower of the Cold War era. This term, popularized by French foreign minister Hubert Védrine in the late 1990s, is controversial and the validity of classifying the United States in this way is disputed. One notable opponent to this theory is Samuel P. Huntington, who rejects this theory in favor of a multipolar balance of power. Other international relations theorists such as Henry Kissinger theorize that because the threat of the Soviet Union no longer exists to formerly American-dominated regions such as Western Europe and Japan, American influence is only declining since the end of the Cold War because such regions no longer need protection or have necessarily similar foreign policies as the United States.
The Soviet Union and the United States fulfilled the superpower criteria in the following ways:
After the dissolution of the Soviet Union in 1991 which ended the Cold War, the post–Cold War world has in the past been considered by some to be a unipolar world, with the United States as the world's sole remaining superpower. In 1999, Samuel P. Huntington wrote: "The United States, of course, is the sole state with preeminence in every domain of power – economic, military, diplomatic, ideological, technological, and cultural – with the reach and capabilities to promote its interests in virtually every part of the world". However, Huntington rejected the claim that the world was unipolar, arguing: "There is now only one superpower. But that does not mean that the world is unipolar," describing it instead as "a strange hybrid, a uni-multipolar system with one superpower and several major powers". He further wrote that "Washington is blind to the fact that it no longer enjoys the dominance it had at the end of the Cold War. It must relearn the game of international politics as a major power, not a superpower, and make compromises".
Experts argue that this older assessment of global politics is too simplified, in part because of the difficulty in classifying the European Union at its current stage of development. Others argue that the notion of a superpower is outdated, considering complex global economic interdependencies and propose that the world is multipolar.
A 2012 report by the National Intelligence Council said that the United States superpower status will have eroded to merely being first among equals by 2030, but that it would remain highest among the world's most powerful countries because of its influence in many different fields and global connections that the great regional powers of the time would not match. Additionally, some experts have suggested the possibility of the United States losing its superpower status completely in the future. Citing speculation of the United States relative decline in power to the rest of the world, economic hardships, a declining dollar, Cold War allies becoming less dependent on the United States and the emergence of future powers around the world.
Some people doubt the existence of superpowers in the post–Cold War era altogether, stating that today's complex global marketplace and the rising interdependency between the world's nations has made the concept of a superpower an idea of the past and that the world is now multipolar. However, the military dominance of the United States remains unquestioned and its international influence has made it an eminent world power
The relations between China and the United States as two powerful geopolitical entities, along with Russia's increasing involvement in the new age of great power competition, is putting the West increasingly at odds on how to deal with the increasingly complex domain in International Relations. According to American diplomat James Dobbins, Professor Howard J. Shatz and Policy Analyst Ali Wyne, Russia in the breakdown of a disintegrating unipolar world order, whilst not a peer competitor to the United States, would still remain a player and a potential rogue state that would undermine global affairs. The West's efforts to contain Russia like the Soviet Union would be tested by covert methods of the Russian Federation United States and members of the European Union. On the other hand, China in contrast to Russia is a peer competitor to the United States and will be a far more challenging entity for the West to confront. It is stated that China's military dominance in the Asia-Pacific is already eroding American influence at a rapid pace and in the near future and that any attempts for the United States to try to reinstate its dominance would only grow steeper and riskier of losing it. Moreover, as competing great powers, China's economic influence had already broken out of its regional confines long ago and is on track on directly contesting the United States role as the center for economic trade and commerce.  
However, the notion of the United States being seen as the sole superpower or China as a newly emerged equal is disputed and split between scholars and political scientists. With the only middle ground being agreed upon is that US global influence have significantly eroded in the 21st century.
The term potential superpowers has been applied by scholars and other qualified commentators to the possibility of several political entities achieving superpower status in the 21st century. Due to their large markets, growing military strength, economic potential, and influence in international affairs, China, the European Union, India and Russia are among the political entities most cited as having the potential of achieving superpower status in the 21st century. However, many historians, writers and critics have expressed doubts whether any of these countries would ever emerge as a new superpower. Some political scientists and other commentators have even suggested that such countries might simply be emerging powers, as opposed to potential superpowers.
The record of such predictions has admittedly not been perfect. For example, in the 1980s, some commentators thought Japan would become a superpower due to its large GDP and high economic growth at the time. However, Japan's economy crashed in 1991, creating a long period of economic slump in the country which has become known as The Lost Years. As of August 2012, Japan had yet to fully recover from the 1991 crash.