The Southern Dobruja reference article from the English Wikipedia on 24-Apr-2004
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Southern Dobruja

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Southern Dobruja (in Bulgarian, Dobrudzha; in Romanian: Dobrogea de sud or Cadrilater) is an area of north-eastern Bulgaria comprising the two former administrative districts named for its two principal cities of Dobrich and Silistra. It has an area of 7565 km² and a population of 358,000.

History

First joined to modern Bulgaria at its restoration as a state in 1878, it was a part of Romania from 1913 until 1940. In 1940, the Nazi Germany imposed Romania in the Treaty of Craiova to cede it to Bulgaria with a population exchange (the Romanian minority was forced to leave the south while the Bulgarian minority had to leave the north).