... if Germany won the war, as they were fast developing into a vast empire. So, the Germans retaliated and attacked and destroyed many American ships which they suspected of carrying supplies to the Allies. This was unrestricted U-boat warfare. The Americans were angered as it led to a loss of American lives and goods. The Germans had been threatening the Americans regularly, namely with the sinking of the liner "Lusitania "in 1915, that led to the loss of 1,200 passengers, including 128 US citizens. Despite this, the Americans did not bring themselves into war until 1917. The final straw was when British intelligence intercepted a telegram sent by the German foreign minister Zimmerman in early 1917. The telegram stated that Germany was to undertake unrestricted submarine warfare against the USA and indicated that Mexico would be rewarded with the territories of Arizona, New Mexico and Texas if it declared war ...

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