Technically Clark doesn't need a visa, as the Kents lied & claimed that Martha gave birth to him. So he has the benefits of a natural born citizen, just like Andrew Jackson - who became president.
SUPERMAN HAS GONE ALL WOKE! IN THE 3RD ISSUE OF ACTION COMICS, SUPERMAN LOCKED A CEO IN A MINE SO HE COULD LEARN WHAT IT WAS LIKE TO BE IN THERE. SUPERMAN HAS ALWAYS BEEN WOKE.