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World War 1 started in 1914 with the assassination of Archduke. Russia was mobilized since the union with Germany, Serbia and Germany made war with Russia. The main reasons why this war started was because of Alliances, Military, Nationalism and Imperialism. The first World War ended in 1918.
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The World War 2 started in 1939 due to the invasion of Poland. France and Britain made war against Germany which is how it all started. There were failures of Peace Efforts, a rise in Fascism, and The Great Depression. The Pearl Harbor made an invasion in the late months of 1941. The war ended due to the bombing of Manhattan Project. The United States dropped 2 atomic bombs on Japan which ended World War 2 in 1945.