FBI would have to search every Sandcrawler that Jawas have.
Sand People would be shot at sight.
You won't be able to sign up for the Academy if you had Watto's accent. (hint: has courses on piloting spacecraft)
Imperial seal would have little white stars and buffalo horns.
Palpatine would have Texan accent.
Vader would wear cowboy's hat (instead of helmet) and belt.
Ion engines would be retrofitted to use petrol as a fuel.
Stormtroopers would be shouting "hou-yaa!" and "semper fi!".
Rebels would be considered "terrorists".
Luke Skywalker would have moustache and tanned skin.
We could only see Leia's eyes as the rest would be obscured by her black clothes.
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Disclaimer: I have nothing against USA, the Lone Star State or Texan people...