English Translation
English has become an international language.
What meaning nuance is intended by making the object a prepositional phrase with “zu”?
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Englisch ist zu einer internationalen Sprache geworden.
Englisch ist eine internatonale Sprache geworden.
I cannot feel a difference here.
In some cases one might argue that one stresses the result, the other the process:
Im Laufe des Turniers ist er ein Spitzenspieler geworden.
Im Laufe des Turniers ist er zu einem Spitzenspieler geworden/gereift.
During the tournament he became a top player.
During the tournament he grew into a top player.
However, the difference is so small, I cannot nail it down.
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Your effort is appreciated and is sufficient as an answer.
I agree with the result vs. process explanation. I wanted to write basically the same, but MRgK was faster 
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