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franz ferdinand assasinated by the serbs because the serbs wanted to be free from austrian rule.

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after the death of Franz Ferdinand Austria declares war on Serbia, understandably mad about their archduke being dead. (plus pre-existing tensions or whatever)

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after france AND russia both joined, germany had to find a way to avoid being streched on 2 fronts, so they decided to try to hit france, defeat them quickly, and then imediatly rush to their front on russia, this did not work.

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though not a very remarkable battle, it did "popularize" trench warfare, which was used for most (if not all) of the rest of the battles in ww1.

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germany sank the lusitania without giving due warning, hightening tensions between america and germany, though not enough to bring america into ww1.

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english intelligence intercepts a note from Germany to Mexico proposing an alliance with Mexico if America were to attack Germany, again heightening tension with America, but America did not yet know if the letter was real or not so they could not declare war, yet.

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after finally verifying that the zimmerman note was real, america joined ww1 against germany.

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Austria-Hungary did not surrender just because of the war, it was also because their system of government was under immense stress. the only way their duel monarchy could survive was if they focused on their country instead of the war.

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after the collapse of Germany's army in the west Germany thought it best to surrender, so they did

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this marks the end of the war but sets up ww2 because of the terrible terms for Germany, including owing a debt of almost 500 billion and taking full responsibility for ww1 even though it was started by austria hungary.