Opioid Class of Analgesics OCW: Introduction to Clinical Pain Problems (J. Haddox) Page - 6
They had their heads full of visions of conquest and glory. Looking back to WWI through the lens of 2007, it would appear to us a foregone conclusion that the US would eventually enter the war on the side of the Allies. However, that is not exactly the case.
The major participants were Germany, Italy and Japan on one side with British Commonwealth, the Soviet Union and the United States on the other. The Allies include Britain and France from Sept 1939. The invaded states of Denmark, Belgium, Netherlands, Norway and Greece joined the Allies.