What was the name of the principle that argued that a state power had the right to send armies into countries to restore monarchies amid revolutions?

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The principle of intervention was a doctrine that stated that a state had the right to intervene in the affairs of another state to restore order and stability, particularly to protect the established order in the face of revolutionary movements. This principle was often used to justify the use of military force to suppress uprisings and restore monarchies, as was seen in the European powers' intervention during the revolutions of 1848.

What Was the Name of the Principle That Argued That