Abstract
While the international history was predominantly centered on Europe (Greek Empire, Roman Empire, French Empire, British Empire, etc.), the continent lost its place of leader at the beginning of the 20th century, "shattered by its long crisis" by 1945. It was surpassed by the two superpowers: the United States of America and the USSR. The United States of America was formerly a colony under the British crown: the first British permanent colony was settled in North America in 1606, at Jamestown, Virginia, and the British influence had lasted until 1776 and the American Declaration of Independence. Led by the politics of non-interventionism, protectionism and isolationism, the United States has known "the most significant systemic change that occurred during the first half of the twentieth century".
