All of that stuff you're talking about worked pre-20th-century. But nation-state susceptibility to takeover already reveals its weakness.
Post-21st century Nationalism is a DOA. Politicians are giving it lip service but it won't go anywhere because it can't, game theory is rigged against it.
The beginning of the end of Nationalism was the rise of the Bank of England in the 1800s. England colonized a large part of the world because they *collaborated* with local elites to help them hide their wealth. Some of it was legitimately earned and they didn't want their countrymen appropriating it, some of it was just stolen, the bank didn't care as long as you put it in an account with them. That's why nobody really resisted colonization, it was in their interest to welcome the British. If you stole from your country and put it in the Bank, you're protected because nobody knows you have the money, the Bank would hide it for you.
That was then, but the problem now is even worse. Today, every nationalistic country faces a dilemma:
A. Maintain aristocratic control over resources, or
B. Embrace neoliberalism and allow clever ambitious people to rise to power.
Every country's aristocracy is squarely aligned with A. But the problem is that when you don't give smart ambitious people a path to the top, someone else will.
So at best, your Nation will bleed its top-IQ performers to Silicon Valley (as they all do). At worst, top performers will collaborate with internationalists to undermine your country's sovereignty. Remember, the people ruling their country are the ones blocking their path to success, so internationalists will be welcomed as friends.
As if that wasn't bad enough, the Bank of England model is still alive as well. Any country that meaningfully taxes billionaires ends up bleeding billionaires to places like Malta, Hong Kong, and Dubai.
This one-two punch is why trying to go back to 20th century nationalism is going to be like going back to horse and buggy. Some will try it, but they will quickly give up when they realize they're fighting nature.