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 American entry into World War I came in April 1917, after more than two and a half years of efforts by President Woodrow Wilson to keep the United States out of the war. Apart from an Anglophile element urging early support for the British, American public opinion reflected that of the president: the sentiment for neutrality was particularly strong among Irish Americans, German Americans and Scandinavian Americans,[2] as well as among church leaders and among women in general. On the other hand, even before World War I had broken out, American opinion had been more negative toward Germany than towards any other country in Europe.[3] Over time, especially after reports of atrocities in Belgium in 1914 and following the sinking of the passenger liner RMS Lusitania in 1915, the American people increasingly came to see Germany as the aggressor in Europe.