What is the purpose of nations?

They have no purpose, nor do they need them. A nation is a historically formed community whose constituents become conscious of their similarities, developed over centuries of communication, shared history and representations thereof in the form of song, art, style and even manners.
Such a thing defies the assignation of purpose or reduction to some instrument designed to achieve this or that. To do so is to 'bottle' a people, the need to do so reflects a certain autism
 
There's no meaningful difference between a nation and a tribe except scale.
People come together and agree, perhaps with a touch of coercion involved, that they're going to follow certain rules and contribute their labor in return for safety and a share of the collective's resources.
That's their purpose. To secure food, shelter, life, and limb of the people within it. Add a touch of "most people like being around like minded people" and their formation is inevitable for any sufficiently advanced group.
 
Same reason US states excist. Trying to treat every region the same regardless of geography, biome and ethnic groups didn't end well for borderless Soviet Union, Yugoslavia and to lesser extent EU. You don't want career politicians pushing their pet project and dysfunctional theory that's utterly dysfunctional.
Different groups have different interests, values and history. Anything unregulated will only end in complete anarchy and self immolation.
 
Gang turf. Borders are where one pedophile-owned tax farm ends and another pedophile-owned tax farm begins. Doesn't matter if the population is entirely ethnically replaced by low IQ third world genetic abominations. The tax farm remains.
 
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