In world-systems theory, core countries (or the imperial core) are the industrialized capitalist and/or imperialist countries. Core countries control and benefit the most resources from the global market. They are usually recognized as wealthy states with a wide variety of resources and are in a favorable location compared to other states. They have strong state institutions, a powerful military, and powerful global political alliances. In the 20th-21st centuries they consist of Australia, New Zealand, Canada, Western European countries, Japan, the United Kingdom, and the United States. The population of the core countries is on average by far the wealthiest of the world, with the highest life expectancy, literacy rate, best education and social welfare on the planet.
Core countries do not always stay "core" permanently. Throughout world history, core countries have been changing, and new ones have been added to the "core" list. These were the Asian, Indian, and Middle Eastern empires in the ages up to the 16th century; prominently Medieval India and the Chinese Empire, which were the richest regions in the world until the European Great Powers took the lead during the early modern period, although the major Asian powers were still very influential in the region. Europe remained ahead of the pack until the 20th century, when the two World Wars were disastrous for the European economies. It was then that the victorious United States and Soviet Union, up to the late 1980s, became the two hegemonic powers, creating a bipolar world order during the Cold War. In 1991, the collapse of the Soviet Union left the United States as the world’s sole remaining superpower, sometimes referred to as a hyperpower.
