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Following the Munich Agreement and the Polish annexation of Zaolzie, Czechoslovakia fell under German occupation during World War II. By 1945, a major portion of the country was liberated by the Red Army, and the subsequent gratitude towards the Soviets, combined with disillusionment with the West for failing to intervene, led the Communist Party of Czechoslovakia to the majority of seats in the 1946 elections. In the 1948 coup d'état, Czechoslovakia became a communist-ruled state. In 1968, the increasing dissatisfaction culminated in attempts to reform the communist regime. The events, known as the Prague Spring of 1968, ended with an invasion by the armies of the Warsaw Pact countries (with the exception of Romania); the troops remained in the country until the 1989 Velvet Revolution, when the communist regime collapsed. On 1 January 1993, Czechoslovakiapeacefully dissolved into its constituent states, the Czech Republic and the Slovak Republic.
In 2006, the Czech Republic became first former member of the Comecon to achieve the status of a developed countryaccording to the World Bank. In addition, the country has the highest level of human development in Central and Eastern Europe, ranking among the top 30 nations in the world. The Czech Republics ranks as the ninth-most peaceful country in Europe, while achieving the best performance in democratic governance and infant mortality in the region. It is a pluralistparliamentary representative democracy with membership in the European Union, NATO, the OECD, the OSCE, the Council of Europe and the Visegrád Group.