The year 1917 was dominated by the Russian Revolution and America entering the war. On 3 February, America cut diplomatic ties with Germany following the announcement on 31 January that Germany would begin unrestricted submarine warfare. All 111 U-boats were ordered to sink any vessel at will. The hope was that Britain would be starved into submission. America declared war on 6 April and US destroyers joined the fight against the U-boats while US...
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History