USA annexes Formosa / Taiwan in 1854

Could there be a United States of Japan, with a version of the US Constitution? How much would it have to be modified to include the Emperor? Could the Ainu get their own nation? Maybe there would be a Japanese Empire, a Japanese Republic and an Ainu Republic.
 
I don't think the powers of the world would look too kindly on the US deciding to go directly imperialist in asia. The knock on effects will outweigh anything like a state of formosa.
 
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