<P> On 11 December 1941 , Adolf Hitler and Nazi Germany declared war against the United States , the same day that the United States declared war on Germany and Italy . </P>
<P> On 11 December 1941 , Adolf Hitler and Nazi Germany declared war against the United States , the same day that the United States declared war on Germany and Italy . </P>
when did the us join world war 2 in europe
when did the us join world war 2 in europe
11 December 1941
11 December 1941