Assuming that Japan and the US are not at war at that point in time, Japan can indeed do that.
Map question
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Do the Aleutian Islands connect to the mainland, or do you need a transport to cross to alaska?
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T R A N S P O R T
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I vote: NO to transports!
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Then I vote no transport from Sicilly to southern Italy.
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And I vote no transport from Berlin to London
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And I vote no transport from Berlin to London
Seconded.
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You need a poll to vote guys, cmon get it together.