True, but also when one state invades and conquers another they typically utilize the existing method of control and oppression, ie. the state system of government, because the people are used to it. Without any centralized power there is no way to assert their authority.An armed populace would stop another state from springing up. The biggest empires in the world have not been a match for guerrilla warfare tactics. Just like the USA could not conquer Vietnam, they will not be able to conquer an anarchist civilization.
The anarchist community would simply refuse consent. The State would simply give up the lost cause. It would cost too much. Like England in the revolutionary war against the colonials.

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