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Poland is a unitary state divided into 16 administrative subdivisions, and its capital and largest city is Warsaw.
Other metropolises include Kraków, Wrocław, Poznań, Gdańsk and Szczecin.
The origin of the name Polanie itself derives from the western Slavic word pole (field).
Since the early 1990s, when the transition to a primarily market-based economy began, Poland has achieved a "very high" ranking on the Human Development Index, The origin of the name Poland derives from a West Slavic tribe of Polans (Polanie) that inhabited the Warta River basin of the historic Greater Poland region in the 8th century.
This union formed the Polish–Lithuanian Commonwealth, one of the largest and most populous countries of 16th and 17th century Europe.
Once a leading European power with a uniquely progressive political system, the Commonwealth ceased to exist as an independent state, following several territorial partitions among Prussia, the Russian Empire, and Austria from 1772 to 1795.
Poland regained its independence in 1918 at the end of World War I, reconstituting much of its historical territory as the Second Polish Republic.
In September 1939, World War II started with the invasion of Poland by Nazi Germany, followed shortly thereafter by invasion by the Soviet Union, both in accordance with the Molotov–Ribbentrop Pact.