Following
the First World War, the closely related Czechs and Slovaks of the
former Austro-Hungarian Empire merged to form Czechoslovakia. During
the interwar years, the new country's leaders were frequently
preoccupied with meeting the demands of other ethnic minorities within
the republic, most notably the Sudeten Germans and the Ruthenians
(Ukrainians). After World War II, a truncated Czechoslovakia fell
within the Soviet sphere of influence. In 1968, an invasion by Warsaw
Pact troops ended the efforts of the country's leaders to liberalize
Communist party rule and create "socialism with a human face."
Anti-Soviet demonstrations the following year ushered in a period of
harsh repression. With the collapse of Soviet authority in 1989,
Czechoslovakia regained its freedom through a peaceful "Velvet
Revolution." On January 1, 1993, the country divided into its two
national components, the Czech Republic and Slovakia. The Czech
Republic joined NATO in 1999 and the European Union in 2004. Czech is
the primary language, but
Slovak is
also spoken.