Statistics for Flags of historical countries that no longer exist

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Answer	% Correct
Soviet Union	100%
Yugoslavia [flag of Socialist Yugoslavia]	94%
East Germany (German Democratic Republic)	91%
Czechoslovakia	90%
Austria-Hungary	88%
Ottoman Empire	83%
Republic of Texas	80%
Kingdom of Prussia	77%
Tibet	74%
Hawaiian Kingdom (later Republic of Hawaii, 1894-98)	65%
South Vietnam (Republic of Vietnam)	65%
Confederate States of America	60%
Zaire	57%
Corsican Republic	51%
South Yemen (People's Democratic Republic of Yemen)	49%
Manchukuo (Empire of Manchuria)	46%
Gran Colombia (Colombia, Venezuela, Ecuador, Panama)	45%
Rhodesia	38%
North Yemen (Yemen Arab Republic)	36%
Orange Free State	32%
United Arab Republic (Egypt + Syria)	31%
Principality of Moldavia	30%
Federal Republic of Central America (aka United Provinces of Central America)	29%
Principality of Wallachia ("Romanian Country")	28%
Chechen Republic of Ichkeria	25%
Sultanate of Zanzibar	24%
Tuvan People's Republic	23%
South African Republic aka Transvaal	21%
Tanganyika	20%
Biafra	18%
Kingdom of Sikkim (protectorate of India before annexation)	16%
Ryukyu Kingdom	14%
Republic of Yucatán	13%
Trucial States (of the Coast of Oman) [now UAE]	11%
Mutawakkilite Kingdom of Yemen (North)	10%
State of Katanga	8%
Don Republic (Don Cossacks)	6%
Italian Regency of Carnaro (Fiume)	5%
Kuban People's Republic (Kuban Cossacks)	5%
Mountainous Republic of the Northern Caucasus	5%
Gagauz Republic (in Moldova)	4%
Hyderabad State	2%
South Kasai	2%