Agreement, Polish annexation of Zaolzie and German occupation of Czechoslovakia and the consequent disillusion with the Western response and gratitude for the liberation of the major portion of Czechoslovakia by the Red Army, the Communist Party of Czechoslovakia won the majority 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, Czechoslovakia peacefully dissolved into its constituent states, the Czech Republic and the Slovak Republic.
The Czech Republic is the first former member of the Comecon to achieve the status of a developed country according to the World Bank. In addition, the country has the highest human development in Central and Eastern Europe, ranking as a "Very High Human Development" nation. It is also ranked as the third most peaceful country in Europe and most democratic and healthy (by infant mortality) country in the region (see Democracy Index and List of countries by infant mortality rate)
