German use of submarines to blockade britain during world war i led to
a german victory.
trench warfare
a war of attrition
the united states entering the war.

German use of submarines to blockade Britain during World War I led to the United States entering the war. The correct option among all the options that are given in the question is the fourth or the last option. before this incident occurred, the United States did not want to enter the war. I hope this helps you.

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