HOW CAN YOU LIST THE SINKING OF THE LUSITANIA AS A CAUSE OF THE USA ENTERING WWI? IT HAPPENED TWO YEARS BEFORE AMERICA DECLARED WAR. BRITAIN’S BLOCADE OF GERMANY WAS IN ACCORDANCE WITH INTERNATIONAL LAW.
Yes, of course you are right that the Lusitania incident was two years before the US entered the war, but it does make all the history books as one of the most significant events that led to the US changing its isolationist position.
Germany did suspend its submarine operations immediately after the Lusitania incident. They only re-launched their submarine campaign in 1917.
The Declaration of London of 1909, did not allow for stoppages of food imports, but only the boarding and searching of vessels for military contraband. International law did not recognise the right of any nation to block food being transported on the open seas to their enemies.