What eastern European border was disputed between it's two nations after World War I, was re-established in 1990 as an identical version of its former self, changed only in the name of one of it's nations?
Suwałki Region Suwałki Region (Polish: "Suwalszczyzna" , Lithuanian: "Suvalkų kraštas, Suvalkija" ) is a small region around the city of Suwałki (known in Lithuanian as "Suvalkai") in northeastern Poland near the border with Lithuania. The territory was disputed between Poland and Lithuania after World War I. This dispute was the main cause of the brief Polish-Lithuanian War and the Sejny Uprising. The conflict was later overshadowed by a much larger and more serious Polish-Lithuanian dispute over the Vilnius Region. The Suwałki Region remains a major center of the Lithuanian minority in Poland.
Central and Eastern Europe Central and Eastern Europe, abbreviated CEE, is a generic term for the group of countries in Central Europe, Southeast Europe/the Balkans, Northeast Europe/the Baltics, and Eastern Europe, usually meaning former communist states in Europe. It is in use after the collapse of the Iron Curtain in 1989–90. In scholarly literature the abbreviations CEE or CEEC are often used for this concept. The definition of this region varies, depending on the source.