Lithuania, officially the Republic of Lithuania (Lithuanian: Lietuvos Respublika) is a country in Balticum, in Europe, and is one of the three Baltic states. Situated along the southeastern shore of the Baltic Sea, it shares borders with Latvia to the north, Belarus to the southeast, Poland, and the Russian exclave of the Kaliningrad Oblast to the southwest. Lithuania is a member of NATO and of the European Union. Its population is 3.4 million. Its capital and largest city is Vilnius.
During the 14th century, Lithuania was the largest country in Europe: present-day Belarus, Ukraine, and parts of Poland and Russia were territories of the Grand Duchy of Lithuania. With the Lublin Union of 1569 Poland and Lithuania formed a new state, the Polish–Lithuanian Commonwealth. The Commonwealth lasted more than two centuries, until neighboring countries systematically dismantled it from 1772 to 1795, with the Russian Empire annexing most of Lithuania’s territory. In the wake of the First World War, Lithuania’s Act of Independence was signed on February 16, 1918, declaring the re-establishment of a sovereign state. Starting in 1940, Lithuania was occupied first by the Soviet Union then Nazi Germany. As World War II neared its end in 1944 and the Nazis retreated, the Soviet Union reoccupied Lithuania. On March 11, 1990, Lithuania became the first Soviet republic to declare its renewed independence.
Present-day Lithuania has one of the fastest growing economies in the European Union. Lithuania became a full member of the Schengen Agreement on 21 December 2007. In 2009, Lithuania will celebrate the millennium of its name.