World War II (WWII) was the deadliest and most catastrophic war in human history. Marked by astonishing events such as the Holocaust and the use of nuclear weapons, World War II represented the largest deployment of military forces of the 20th century. Two factions, the Axis and the Allies, entered into a global military altercation that began with the German invasion of Poland on September 1, 1939 and ended with the surrender of Japan on September 2, 1945. A review of human motivations, including necessity as revenge, power and extreme nationalism (chauvinism) can explain the roots of the Second World War. In historical terms, the Treaty of Versailles, increased military spending and alliances, and expansionist ideologies were the main catalysts of nationalistic and diplomatic tensions in 1930s Europe, laying the foundation for World War II. On January 18, 1919, approximately two months after the height of World War I (WWI), the Paris Peace Conference (PPC) met to establish the terms of peace and to plan the course of the post-WWI era World. The Treaty of Versailles became the centerpiece of the conference. France attended the conference seeking revenge; Britain wanted to weaken the militaries and economies for the Central Powers (losing side of the First World War). Meanwhile, the President of the United States, Woodrow Wilson, promoted his Fourteen Points. In these he traced the need for open diplomacy, disarmament and respect for national groups. Ultimately, the Treaty of Versailles outlined the creation of the League of Nations (LON), forced Germany to accept all the blame for World War I, and established harsh sanctions focused on debilitating the governments of the Central Powers. As established by the Treaty of Versailles, the LON consisted of an international organization... middle of paper... a solar system integrated by the United States, the Soviet Union, and the Rome-Berlin-Tokyo coalition. Despite the turbulence caused by the Great Depression, Hitler considered the United States to be the most important global economic power. His ultimate goal was for Germany to achieve world domination and he recognized that to do this Germany had to defeat the United States. Hitler developed a systematic expansionist plan. First, he recognized Soviet military supremacy and believed that before crushing them he would have to conquer Great Britain and France. Second, after securing control of the British and French, Hitler would unify Europe under a single militia and later attack the Soviets. Third, after successfully overthrowing the Soviets and achieving European hegemony, Hitler believed that he would victoriously defeat the United States and achieve global supremacy..