It happened in the United States before the first world war, and continued for a few decades after that. Pretty long time to be called "immediately". While it was unpleasant from our current POV, it was way better than anything else at that time, and didn't end because it dissolved, but because the world wars needed funding.

I see that you are not up on the Sherman Antitrust Act. Go ahead, I'll wait.

The 1890s demonstrated what a Libertarian regime would dissolve into, instantly: Absolute rule by the biggest dog. It has happened myriad times in human history, from all kinds of pre-conditions. We were lucky, 130 years ago, that the armed forces still believed in voting. Not sure they still do...

Hmm. Are you sure you understand libertarianism? I’m also unsure of your claim here about “libertarianism” dissolving into something unpleasant. Unpleasant in what way? Why would it “dissolve”?