A "Nation State" is a sovereign nation. A group with definite territory that legitimizes it's right to rule by the fact that it exists. A "City State" is like a nation state but smaller, it's a city and it's territories. ... Cities that were only responsible to themselves, they weren't ruled by any higher power.
The most famous ones are China and the United States. Both countries work all over the world both politically and economically. They have factories and business all around the world and often the companies are even richer than the states themselves where the companies are operating.
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