<Li> Islamic Republic of Tatarstan--1992 until annexed by the Russian Federation in 1994 . </Li> <Li> Republic of Texas--Annexed by United States in 1846 . </Li> <Li> Tibet--Unified Tibetan empire was created in the 8th century . Mongol conquests in the 13th century made Tibet part of a Mongol - ruled Chinese empire, and four centuries later the Manchu - ruled Qing Dynasty formed a patron - priest relationship with Tibet's spiritual rulers . In 1914, China refused to ratify a treaty which would have granted China suzerainty over "Inner Tibet" and "Outer Tibet," establishing direct rule over the former and leaving the latter autonomous . In 1950, a Chinese army invaded Tibet . The region remains under Chinese control . </Li> <Li> Transvaal Republic (South African Republic)--Independent country before becoming part of the British Empire during the Second Boer War in 1902 and is currently part of South Africa . It was one of two Boer republics, the other was the Orange Free State . </Li>

What european nations ceased to exist after world war 1