1 янв 1820 г. - Protocol of Troppeau
Описание:
The result of the Congress of Troppeau (Russia, Prussia, and Austria-Hungary); declaration that asserted that stable governments might intervene to restore order in countries experiencing revolution; an agreement among the major European powers in 1820 allowing one government to intervene in the affairs of another in order to restore stability; agreement amng Eastern Great Powers to oppose revolutionary states)
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