To the degree that Korea isn't free, it's is because they've spent their entire existence at war with the largest and most powerful global empire in history and have been cut off from international trade.
The US isn't free because it's a fascist state. The Korean peninsula isn't free also because the US is a fascist state.
Now let's hear your next vapid quip that's supposed to mean more than objective facts and inarguable history, redditor. I don't want you to lose even a bit of steam acting like you're the smartest person in the room while displaying no knowledge about anything.
This would have the content of an actually valuable conversation if you could figure out how to ask questions without making their purpose to come off as incredulous and incurious as you are right now.
It's literally in Mein Kampf. Lebensraum is explicitly intended to be a mirroring of the US doing westward expansion into land held by native tribes. In his writings he made the comparison all the time. It's not a secret unless you had an American education.
They even had illustrated children's books writing a new national mythos along the same lines as cowboys and indians. The United States is Nazi Germany 200 years after Hitler won the war.
Original brainchild for Lebensraum explicitly points to Manifest Destiny: https://encyclopedia.ushmm.org/content/en/article/lebensraum. You can slap "lebensraum" and "manifest destiny" into google and also see the results for yourself. I admit say I'm not a well of primary nazi sources if that doesn't satisfy you.