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Moldavia and Wallachia formally united, creating the Romanian United Principalities.
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Moldavia
Historical region and former principality in Central and Eastern Europe
Moldavia is a historical region and former principality in Eastern Europe, corresponding to the territory between the Eastern Carpathians and the Dniester River. An initially independent and later autonomous state, it existed from the 14th century to 1859, when it united with…Source: Wikipedia (CC BY-SA)
Wallachia
Historical and geographical region of Romania
Wallachia or Walachia is a historical and geographical region of modern-day Romania. It is situated north of the Lower Danube and south of the Southern Carpathians. Wallachia was traditionally divided into two sections, Muntenia and Oltenia. Dobruja could sometimes be considered…Source: Wikipedia (CC BY-SA)
United Principalities of Moldavia and Wallachia
1859–1881 personal union and early form of the modern Romanian state
The United Principalities of Moldavia and Wallachia, commonly called United Principalities or Wallachia and Moldavia, was the personal union of the Principality of Moldavia and the Principality of Wallachia. The union was formed on 5 February [O.S. 24 January] 1859 when…Source: Wikipedia (CC BY-SA)