What was the most important event propelling the United States into the Grand Alliance with Great Britain and the Soviet Union during WWII?
A.
Germany's invasion of the Soviet Union
B.
the Japanese attack on Pearl Harbor
C.
the discovery of Nazi concentration camps
D.
the America First policy
the us mane reason for joining world war 2 is because japan bombed pearl harber causing the us the team up with russua and britain and they nuked jappan srry for spelling
