Entry of U.S. into World War II - December 1941.
Spotted your mistake yet?
Not yet, please help me out. I didn’t comment about Iran. Perhaps you have the wrong poster?
There were vast numbers of Americans directly involved in WWI long before December 7.
No doubt there's some OSS guy who wrote his memoirs and included his days in Iran pre-Dec 7.
This worked the other way around too. As you know the Soviets didn't enter into the Pacific War until quite late ~ Japan was on the ropes. Still, they maintained an aggressive military posture in and around their Easternmost port facilities so that American materiel for use on the Western front could be safely unloaded and moved.
The Soviets were definitely prepared to deal with the Japanese in the Far East. Many of us have known US military personnel who were assigned to Soviet units in the Soviet Far East during that period.
These were desperate times and desperate measures were necessary. Everything wasn't as clear-cut as some today might wish.