@Caesar:
I mean the US did sell weapons to Germany at one point that ironically got used against the US during WWI.
There’s a mildly amusing scene (from today’s perspective; at the time, it would probably have been viewed as angrily sarcastic) in the WWII movie Destination Tokyo, in which Cary Grant plays the skipper of a US submarine. Grant and a crewman have just defused a bomb (fortunately a dud, owing to faulty firing pin) that was dropped on the sub by a Japanese plane and that lodged between the outer hull and the pressure hull. They return inside the sub, where Grant shows the removed fuse to his crew and says, “It’s got ‘Made in USA’ stamped on it.”
On a related trivia note: the A&A standard Japanese transport ship sculpt, the Hakusan Maru, is based on a ship that was originally American. It was constructed by the Federal Shipbuilding Company of Kearny, New Jersey, for the US Navy during WWI. It served from late 1918 to mid-1919, then was put in reserve until 1937, when it was sold to the British. The British chartered it to the Japanese, who seized it and renamed it when WWII broke out in the Pacific. In a further irony, it was torpedoed and sunk by a US submarine, just two months before Japan surrendered.