<P> On December 7 , 1917 , the U.S. declared war on Austria - Hungary . </P>
<P> On December 7 , 1917 , the U.S. declared war on Austria - Hungary . </P>
when did the united states entered the first world war
when did the united states entered the first world war
December 7 , 1917
December 7 , 1917