Temporary capital of Lithuania during the invasion of Poland, to Lithuania according to the Soviet–Lithuanian Mutual Assistance Treaty. Since then Vilnius has been the capital of the Lithuanian SSR and then independent Lithuania. Lithuania refused to have diplomatic relations between Poland and Lithuania until the ultimatum of 1938. Railroad traffic, telegraph lines or even mail could not cross the Polish–Lithuanian border. Lithuania continued to declare Vilnius as its capital in all official documents, including the constitution. Since the city was controlled by Poland, all Lithuanian authorities were transferred to the city of Kaunas, which became the seat of the government. To reconcile reality with
History of the Jews in Lithuania the lands between the Baltic and Black Seas that would become part of the Grand Duchy of Lithuania. The later and much larger stream of immigration originated in the 12th century and received an impetus from the persecution of the German Jews by the Crusaders. The traditional language of the vast majority of Jews of Lithuania, Yiddish, is based largely upon the Medieval German spoken by the western Germanic Jewish immigrants. The peculiar conditions that prevailed in Lithuania compelled the first Jewish settlers to adopt a different mode of life from that followed by their western co-religionists. In Lithuania of