If Japan had declared war on Britain in September 1939, would the US have joined in?

If Japan declared war on France and Britain when France and Britain declared war on Germany in September 1939, would the US declare war on Germany and Japan?
 
No

If Japan declared war on France and Britain when France and Britain declared war on Germany in September 1939, would the US declare war on Germany and Japan?
No.

There would be no constituency for it in the US. Though it might bring forward moves to rearm and expand the Navy. Two-Ocean Act almost a year earlier?
 
I thought the Japanese and British were already at war by 1939

Wernt the repulse and Renounce already destroyed along with Germany and the British at war
Or was that a year later
 
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