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The Germans had been slowly building up their military after the fall of the Weimar Republic; their invasion of Poland in 1939 was probably the most immediate cause of the world war.
The German invasion of Poland in 1939.
The attack on Pearl Harbor
The assassination of Archduke Franz Ferdinand.
The main cause of world war 1 was all of the alliances nations made. It was also because Archduke Franz Ferdinand was assassinated by a terrorist.
Only one single event caused the war. The assassination of Archduke Franz Ferdinand was the immediate cause of the war. The four long term causes were Militarism, alliances, Imperialism and Nationalism.
The immediate cause of the first revolution in March 1917 was the disastrous impact of the First World War.
The Germans had been slowly building up their military after the fall of the Weimar Republic; their invasion of Poland in 1939 was probably the most immediate cause of the world war.
The German invasion of Poland in 1939.
The attack on Pearl Harbor
The assassination of Archduke Franz Ferdinand.
The death of Archduke Franz Ferdinand of Austo-Hungary was the immediate cause of WW I, which in turn was a historical event of immense consequence, that changed the world forever. So this was a really big deal.
That was the Archduke Franz Ferdinand.
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The German invasion of Poland on 1 September 1939
The main cause of world war 1 was all of the alliances nations made. It was also because Archduke Franz Ferdinand was assassinated by a terrorist.
In Europe it was the attack of Poland by the German Nazis on 9-1-39. In the Pacific it was the attack on the US Naval Fleet at Pearl Harbor, Hawaii by the Japanese on 12-7-41 that was the immediate cause of World War 2 for the USA.