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  archeduke was killed by by a Serbian nationalist in Sarajevo, Bosnia. which started ww1
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  germans launched a torpedo at the famous lusitanian ship. which end up killing thousand of people.
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  unrestricted submarine warfare by the germans and help from the allies led to U.S involvment.
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  this was to draw peacekeeping between the nations. U.S saneate didnt confirm this treaty nor did they participate in the League of nations
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  The Treaty of Versailes ended WW1 between Germany and the Allied Powers. germany was forced to pay reparations.