Slavery played the central role during the American Civil War. The primary catalyst for secession was slavery, especially Southern political leaders' resistance to attempts by Northern antislavery political forces to block the expansion of slavery into the western territories.
On May 7, 1915, a german submarine torpedoed and sank the Lusitania, a British cruiseliner which had 128 American citizens on board, as well as military goods. It was the first step to the US joining the war.
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After the end of World War II it was the time of decline of European colonies which lead to the rise of new superpowers and emergence of several new countries on the map.
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After WWII Europe was divided into USA captured Europe and USSR capture Europe. The end of the war increased the rate of decolonization. Independence being granted from great powers like India from United Kingdom, Indonesia from Netherland. The Philippines from The United States and several Arab nations get free from the superpowers.
This happened because the superpowers were badly affected by the war and they were not able to rule other nations anymore so they have to step back. Thus how the World War II led to the origin of independence and even the formation of so many new countries and nations.
He wanted it to be used against Japan.
A. American-Soviet competition for military dominance
