Unification Day is celebrated on September 6, in honor of the unification of Eastern Rumelia and the Principality of Bulgaria on September 6, 1885.
Bulgaria became part of the Ottoman Empire in 1396. In April 1876, there was a series of revolts against Ottoman rule in Bulgaria.
The harsh suppression of the uprisings by the Ottomans led to widespread international condemnation and in April 1877, Russia officially declared war on the Ottoman Empire. The war ended in March 1878 with the signing of the Treaty of St. Stephen.
The Great Powers at the time believed that the peace treaty created a Bulgaria that was too large and would have too much influence in the region. As a result, under the Treaty of Berlin in 1878, Southern Bulgaria (Eastern Rumelia) was separated from the Principality of Bulgaria and returned to the Ottoman Empire, with partial autonomy.
The Bulgarians thought that the decision of the Berlin Treaty was unfair. Over the next seven years, initially peaceful protests gave way to insurgency and conflict. The Bulgarian Central Revolutionary Central Committee was formed in February 1885, which organized events and riots in the cities of Eastern Rumelia, designed to aid the unification process. On September 6, 1885, Bulgaria and Eastern Rumelia announced their union in Plovdiv.
The union angered several powerful nations and led to the Serbo-Bulgarian War. Bulgaria emerged victorious from this conflict and decided to accept its borders.
Many in Bulgaria consider the events of September 6, 1885, more important for the creation of Bulgaria than the signing of the Treaty of St. Stephen on March 3, 1877, which marks the National Day of Bulgaria.
Unification Day celebrations were centered in Plovdiv, where the union was announced; although other cities across the country will commemorate the anniversary of the union with parades and ceremonies./ ibna