September 6, 2020 marks the 135th anniversary of the Union between the Principality of Bulgaria and Eastern Rumelia. On this occasion, the NIM presents a virtual exhibition "135 years of Unification" with some of the most interesting photographs and objects from its collection related to the Unification.

1878 was the year that returned the liberated Bulgarian state to the map of Europe, but due to the decisions of the Berlin Congress, which tore the Bulgarian land into several parts, this year also marked the beginning of the struggle for national unification of the Bulgarians.

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