Earlier quoted context omitted.
Is it possible that the solutions in other countries are not optimal?
No, every other country outside the US is the best at everything. That's why every American is desperate to make a better life for themselves in the EU, Australia, New Zealand and Canada while the reverse almost never happens.
You can’t start your topic broad “every American” and then use the much less broad amount of immigrants to “prove” your point.
Because “every American” means I can’t bring up the non-zero amount of Americans that do emigrate elsewhere.
Your entire argument is in bad faith.