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The Kingdom of Italy signs a treaty guaranteeing the independence of its tiny neighbor, San Marino

Northern Italy, 1857, zoomable map
03/22/1862
In Turin, Italy and San Marino signed a convention that guaranteed the independence of the tiny republic, now almost completely surrounded by the new kingdom.  The document detailed a close cooperation in commerce and trade between the two - San Marino coinage was deemed acceptable in Italy, for example - as well as the treatment of crime, extradition, and other judicial matters. The agreement has stood since and San Marino remains independent today.  (By John Osborne)
Source Citation: 
Edward Hertslett, ed., The Map of Europe by Treaty: Showing the Various Political and Territorial Changes ... (London:  Butterworth's, 1875), II: 1508-1509. 

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