Category
page 1Former state unions
Serbia and Montenegro
federal republic (1992–2003) and political union (2003–2006) in the Balkans
Polish–Lithuanian Commonwealth
historical multinational monarchist state in Eastern Europe (Crown of the Kingdom of Poland and the Grand Duchy of Lithuania)
United Arab Republic
Middle Eastern state between 1958 and 1961 in the present territories of Egypt and Syria
Kalmar Union
former country. personal union of the three kingdoms of Denmark, Sweden and Norway (1397–1523)

Denmark–Norway
Denmark–Norway was a 16th-to-19th-century multi-national and multi-lingual real union consisting of the Kingdom of Denmark, the Kingdom of Norway (including the then Norwegian overseas possessions: the Faroe Islands, Iceland, Greenland, and other possessions), the Duchy of Schleswig, and the Duchy of Holstein. The state also claimed sovereignty over three historical peoples: Frisians, Gutes and Wends. Denmark–Norway had several colonies, namely the Danish Gold Coast, Danish India (the Nicobar Islands, Serampore, Tharangambadi), and the Danish West Indies.
Union between Sweden and Norway
personal union between Sweden and Norway 1814–1905