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  1. Causes of World War II - Wikipedia

    The immediate precipitating event was the invasion of Poland by Nazi Germany on September 1, 1939, and the subsequent declarations of war on Germany made by Britain and France, but many other …

  2. How Did World War II Start? - Encyclopedia Britannica

    1 day ago · World War II began when Germany invaded Poland on September 1, 1939. This followed German resentment over the terms of the Treaty of Versailles after World War I and Adolf Hitler’s …

  3. World War II: Causes, Timeline, Key Battles, Facts & Legacy

    Oct 29, 2009 · On September 1, 1939, Hitler invaded Poland from the west; two days later, France and Britain declared war on Germany, beginning World War II.

  4. The Causes of WWII - World History Encyclopedia

    Mar 26, 2024 · The origins of the Second World War (1939-45) may be traced back to the harsh peace settlement of the First World War (1914-18) and the economic crisis of the 1930s, while more …

  5. What Were The Main Causes Of World War II? - WorldAtlas

    World War II began on September 1, 1939, when Germany invaded Poland. However, while this invasion was the sparkplug for the conflict, its underlying roots went back decades.

  6. Why Did World War II Happen? | CFR Education

    Jul 25, 2023 · Granted, Germany’s invasion of Poland in 1939 triggered declarations of war from France and the United Kingdom, formally starting World War II. But that event was only the final straw in a...

  7. World War II Timeline (1939–1945) | Fact Monster

    6 days ago · What Started WW2? Unlike World War I, which was sparked by the assassination of Archduke Ferdinand in 1914, the buildup to the second world war was gradual, and included events …

  8. The causes of World War Two - World War Two and the Holocaust - BBC

    When Hitler broke the agreement made at the Munich Conference, it became clear appeasement had failed, and war broke out following the invasion of Poland in September 1939. Hitler had three main...

  9. World War II | Facts, Summary, History, Dates, Combatants, & Causes ...

    1 day ago · World War II began in Europe on September 1, 1939, when Germany invaded Poland. Great Britain and France responded by declaring war on Germany on September 3. The war between the …

  10. World War II - Wikipedia

    World War II is generally considered to have begun on 1 September 1939, when Nazi Germany, under Adolf Hitler, invaded Poland, after which the United Kingdom and France declared war on Germany.