Statistics for Official names of former countries

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Hint	Answer	% Correct
East Germany	the German Democratic Republic	70%
Danzig	the Free City of Danzig	60%
Soviet-Union	the Union of Soviet Socialist Republics	50%
Scotland	the Kingdom of Scotland	40%
the Confederacy	the Confederate States of America	30%
Ming Dynasty	the Great Ming	30%
Venice	the Republic of Venice	30%
North Vietnam	the Democratic Republic of Vietnam	20%
Prussia	the Kingdom of Prussia	20%
Austria-Hungary	the Austro-Hungarian Monarchy	10%
British Empire	the Kingdom of Great Britain	10%
Gran Colombia	the Republic of Colombia	10%
Ottoman Empire	the Sublime Ottoman State	10%
Persian Empire	the Achaemenid Empire	0%
Czechoslovakia	the Czech and Slovak Federal Republic	0%
Mongol Empire	the Great Mongol Nation	0%
Polish-Lithuanian Commonwealth	the Kingdom of Poland and the Grand Duchy of Lithuania	0%
Yugoslavia	the Socialist Federal Republic of Yugoslavia	0%
Tannu Tuva	the Tuvan People's Republic	0%
Sweden-Norway	the United Kingdoms of Sweden and Norway	0%