Unification Day in Bulgaria
Unification Day in Bulgaria is held on September 6. This event in the first decade of the month September is annual. 
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Bulgaria is the oldest country in Europe that hasn't changed its name since it was first established. Sofia, the capital of Bulgaria, was founded 7000 years ago.
On this day in 1885 in Plovdiv, after a military coup, a temporary government was formed, which announced the accession of Eastern Rumelia to the Principality of Bulgaria.
6th of September is the day on which the actual unification of the Principality of Bulgaria and Eastern Rumelia takes place. An act that gave the country of Bulgaria the right to return to its borders, lands, that historically belong to it. The Act of Union received diplomatic and international recognition in 1886.
Similar holidays and events, festivals and interesting facts
Beginning of the Orthodox Church Year on September 1
Nativity of the Virgin Mary on September 8
Bulgaria Independence Day on September 22 (celebrates the independence of Bulgaria from the Ottoman Empire in 1908);
Bulgaria Air Force Day on October 16
National Awakening Day in Bulgaria on November 1
World Romani Language Day on November 5
St. Stephen's Day on December 26 (public holiday in Alsace, Austria, Andorra, Catalonia, Croatia, the Czech Republic, Germany, Hong Kong, Italy, Ireland, Luxembourg, Poland, Slovakia and Switzerland);
Father's day in Bulgaria on December 26