Thanks for the link Pierz
True free market liberalism, in the more classical sense and not the present day sense, does lead to less faith in nations and less of a belief in national division. If all men are equal with the same natural rights then it doesn't matter where you're from or where you're going for that matter. Americans have no more or less rights than Iranians. Nationalism is a regressive , illiberal (in the classical sense) ideology from the stance of liberty.
Indeed
Now, whether that leads to a global nation where we dissolve national boundaries because they're irrelevant or we go the opposite route and shrink government into practical nonexistence as you see in libertarianism is, I suppose, a matter of debate.
Yes, it's debatable - no definitive answers here. This problem is not solvable by praxeology alone.
We (liberals) all agree that the best of all worlds would be a stateless one, with universal respect for property rights, on a global scale.
The question is: what is the form of social organization which allows us to most nearly approximate that ideal?
Anarcho-capitalists have their answer. For we minarchists (realists, I would say), it's more complicated. First, there's the question of what form of government (on whatever scale) is most conducive to liberalism. Then there's the question of the scale: modern nation-states, hyperfederalism ala Moldbug's patchwork, world government? The obvious advantage of world government, per Mises, is the elimination of war. But there are disadvantages; (a) any centralized world government would face tremendous diseconomies of scale, and (b) there would be an absence of interstate economic competition, which removes one incentive for liberal economic policy. However, both problems are potentially ameliorated, if not eliminated, by a proprietary (for profit, as a business) world state - which, if rational, would volunarily decentralize, "franchise," governance to local authorities, to overcome diseconomies of scale, and allow for internal economic competition between those local political units - i.e. such a policy would increase the tax revenues of the for-profit central government in the long-run.
I know I favor the latter over the former if only because I have less faith in humanity than von Mises apparently does.
I don't think it's a matter of faith in the goodness of humankind, as I have essentially none, and take the opposite position.
In fact, my preference for world government (provided it is proprietary) is rooted entirely is my faith in the
greediness of humankind.
That's the only human trait that can be relied upon, century in, century out.
It's why the market economy works; it's why proprietary government would work.