>>10
Look at early America. There's your evidence. That wasn't technically libertarianism, but classical liberalism of Old West was close enough and it worked awesomely. Pre-WW1 times. By WW1 there were too much people. Cities and companies got too big. Lots of people leads only to fascism/communism and great suffering. If we somehow could preserve classical liberal rural state forever without having to resort into oppressive measures or losing any technological advancement it would be greatest thing ever.