A nation is a group of people. A nation state is what the world is mostly made up of now. For example, you can have the German nation without having a unified nation state (west vs east). Also, ancient Greece was filled with city states but it was a Greek nation.
Depends on how you use the word.
Depends.
If you consider Minarchists as “true libertarians,” then they would most likely be in favor of nations.
If you consider anarchist as “true libertarians,” then they would most likely see a nation as arbitrary and antithetical to their beliefs.
If a nation is just a group of people unified by culture and language (philosophy?) then a libertarian nation already exists although in a disconnected, disparate form geographically speaking.
Meh, I thought that was implied : /
I didn’t read the OP, but I’m sure that nation = state was what the definition that people were using, but I was just throwing it out there that the idea of a nation =/= state is in fact valid. In theory, America (or any country) could become a libertarian nation without having some kind of statist system.