Unipolarity in the context of "Manius Acilius Glabrio (consul 191 BC)"

The term foremost power has been used by political scientists and historians to describe the allegedly greatest power in the world, or in a given region, during a certain period of history. Multiple empires have been described as such, often for the same time period, resulting in a problematic assessment of the conflicting scholarly opinions and points of view on the matter. There is therefore a general lack of consensus between the various authors and scholars in reference to the nations and empires that were allegedly the world's most powerful at various points in history.

The status of foremost power globally implies that of superpower. However, it does not necessarily mean that the world is unipolar nor that there is a sole superpower. Currently, the United States is no longer an uncontested superpower, partly due to not dominating in every single domain (i.e. military, culture, economy, technology, diplomatic) in every part of the world. Although it is still the most powerful military and has the largest economy by nominal GDP (although China has surpassed the United States in GDP purchasing power parity, and could surpass the United States nominal GDP in the coming decades), China has made significant gains in cultural influence and technology. The United States became the world's foremost power at the end of the Second World War, as the Soviet Union was a power of comparable influence, but lagged far behind the United States in economy and wealth. The United States remained the world's foremost power until the dissolution of the Soviet Union in 1991, at which point it became the world's sole superpower. Opinions differ on when China's rise changed the United States' position from an uncontested sole superpower to a contested one. However, most agree that this happened sometime in the late 2000s or early 2010s post-Great Recession. While China's rise decreases the power gap between them and the United States, the United States is forecasted to remain the world's foremost power for the next couple of decades.