Category: History
Question: During the eighteenth century, this nation was partitioned three times by its neighbors. Its first elected president was a former shipyard electrician and leader of the Solidarity movement, Lech Walesa (“vaw- WESS-uh”), and it was the home country of Pope John Paul II. For 10 points, Germany's September 1939 invasion of what nation prompted Britain and France to enter World War II after the bombing of Warsaw?
Answer: Republic of {Poland} [or Rzeczpospolita {Polska}]

Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, and has a temperate transitional climate, while its longest river is the Vistula. Poland is the fifth-most populous member state of the European Union, with its sixteen voivodeships comprising a total population of over 38 million and covering a combined area of 312,696 km2 (120,733 sq mi). It is bordered by Lithuania and Russia to the northeast, Belarus and Ukraine to the east, Slovakia and the Czech Republic to the south, and Germany to the west. The nation's capital and largest metropolis is Warsaw. Other major cities include Kraków, Wrocław, Łódź, Poznań, and Gdańsk.
Prehistoric human activity on Polish soil dates to the Lower Paleolithic, with continuous settlement since the end of the Last Glacial Period. Culturally diverse throughout late antiquity, in the early medieval period the region became inhabited by the tribal Polans, who gave Poland its name. The process of establishing proper statehood, which began in 966, coincided with the conversion of a pagan ruler of the Polans to Christianity, under the auspices of the Roman Catholic Church. The Kingdom of Poland emerged in 1025, and in 1569 cemented its long-standing association with Lithuania, thus forming the Polish–Lithuanian Commonwealth. At the time, the Commonwealth was one of the great powers of Europe, with a uniquely liberal political system which adopted Europe's first modern constitution in 1791.
With the passing of the prosperous Polish Golden Age, the country was partitioned by neighbouring states at the end of the 18th century. Poland regained its independence in 1918 as the Second Polish Republic and successfully defended it in the Polish–Soviet War from 1919 to 1921. In September 1939, the invasion of Poland by Germany and the Soviet Union marked the beginning of World War II, which resulted in the Holocaust and millions of Polish casualties. Forced into the Eastern Bloc in the global Cold War, the Polish People's Republic was a founding signatory of the Warsaw Pact. Through the emergence and contributions of the Solidarity movement, the communist government was dissolved and Poland re-established itself as a democratic state in 1989.
Poland is a parliamentary republic, with its bicameral legislature comprising the Sejm and the Senate. It is a developed market and a high-income economy. Considered a middle power, Poland has the sixth-largest economy in the European Union by GDP (nominal) and the fifth-largest by GDP (PPP). It provides a very high standard of living, safety, and economic freedom, as well as free university education and a universal health care system. The country has 17 UNESCO World Heritage Sites, 15 of which are cultural. Poland is a founding member state of the United Nations, as well as a member of the World Trade Organization, OECD, NATO, and the European Union (including the Schengen Area).