US military sales are not limited to subs. Doubtless they want to sell more planes and everything else. You can look up graphs of US arms exports, it’s a lot.
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I’m not aware of the US selling their subs to anyone. They had a partial tech-sharing program with the UK a while back.
And they are helping the Aussies develop nuclear-powered subs, notably with UK reactors, though.
Although the US/Aus deal scuppered a Aus/France deal for subs IIRC.
The Chinese would have landed in Sydney by the time the French laid the keels for the subs in the deal they struck with Australia.
US military sales are not limited to subs. Doubtless they want to sell more planes and everything else. You can look up graphs of US arms exports, it’s a lot.