Pope John Paul II is the most relentless self-promoter on the planet. There is little objective evidence confirming your statement, only the lavish praise of strategically placed spinmeisters.
If anything, the man appears to be a socialist, and does not share many of the goals or values of Americans.
There is plenty of evidence. It’s called history. Check it out.
If you’re going to call the Pope a socialist, then call Jesus one too.