Republic of Central Lithuania authority over the area. Instead, it continued to treat the so-called Vilnius Region as part of its own territory and the city itself as its constitutional capital, with Kaunas being only a temporary seat of government. The dispute over the Vilnius region resulted in much tensions in the Polish-Lithuanian relations in the interwar period. Some historians have argued that if Poland had not prevailed in the Polish-Soviet War, Lithuania would have been invaded by the Soviets, and would never have experienced two decades of independence. Under this scenario, despite the Soviet-Lithuanian Treaty of 1920, Lithuania was very close to being
National symbols of Lithuania Soviet occupation of Lithuania, the Lithuanian flag and the national anthem were replaced; the Lithuanian Coat of Arms was not shown in official capacities. On the other hand, in keeping with the Soviet policy of encouraging what were seen as harmless expressions of ethnic identity, Lithuanian national costumes were often featured on postal stamps and elsewhere. Lithuania was occupied by Soviet Union in 1940-1941, later it was controlled Nazi government during World War II and was a Soviet Socialist Republic from 1944 until 1990. The latter situation is generally seen by Lithuanians as an occupation. Public displays of both the