when did the usa join the core of the modern world system
Core countries Core countries do not always stay core permanently. Throughout history, core nations have been changing and new ones have been added to the core list. The most influential countries in the past have been what would be considered core. These were the Asian, Indian and Middle Eastern empires in the ages up to the 16th century, prominently India and China were the richest regions in the world until the 15th century, when the European powers took the lead, although the major Asian powers such as China were still very influential in the region. Europe remained ahead of the pack until the 20th century, when the two World Wars turned disastrous for the European economies. It is then that the victorious United States and Soviet Union, up to late 1980s, became the two hegemons, creating a bipolar world order. The heart of civilisation consists of Western Europe, North America, Australasia and Japan. The population of the core is by far the wealthiest and best educated on the planet.
United States in World War I The U.S. made its major contributions in terms of supplies, raw material and money, starting in 1917. American soldiers under General John Pershing, Commander-in-Chief of the American Expeditionary Force (AEF), arrived in large numbers on the Western Front in the summer of 1918. During the war the U.S. mobilized over 4 million military personnel and suffered 110,000 deaths, including around 45,000 who died due to the 1918 Spanish flu outbreak (30,000 before they even reached France).[1][2] The war saw a dramatic expansion of the United States government in an effort to harness the war effort and a significant increase in the size of the U.S. Armed Forces.