You’re right, the reverse, ie “every Australian (etc)” wanting to make a better life for themselves in the US does never happen.

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.

Bad faith?

Seemed like a tongue-in-cheek quip to demonstrate that there are a lot more folks in the world who are trying to come to the U.S. than the opposite, which as far as I know is pretty true.

"According to a Gallup poll from January 2019, 16% of Americans, including 40% of women under the age of 30, would like to leave the United States."

In my experience of talking to said Americans, that many can't is largely a case of restrictive immigration policies in most places Americans would like to move to.

Citing 'college girls want to go abroad' is not particularly convincing

“ Though relatively average by global standards, the 16% of Americans overall who said in 2017 and again in 2018 that they would like to permanently move to another country -- if they could -- is higher than the average levels during either the George W. Bush (11%) or Barack Obama administration (10%).”

So usually America has lower than average citizens wanting to emigrate. Trump made Trump haters want to leave, bringing it up to global averages.

That’s a significant jump, but being globally average does not fit the narrative you’re trying to portray.