The Republic of Poland and Czechoslovakia established relations early in the interwar period, after both countries gained independence. Those relations were somewhat strained by the Polish–Czechoslovak border conflicts over Zaolzie and Cieszyn in the early 1920s and late 1930s (see also Munich Agreement). Both countries joined the Allies during World War II. After the war they both fell into the Soviet sphere of influence (the Eastern Bloc). Poland, together with other Eastern Bloc countries, participated in the Warsaw Pact invasion of Czechoslovakia in 1968. Relations between the two countries were nonetheless rather amicable, but became somewhat strained in the aftermath of the rise of the Solidarity movement in Poland in 1980 and 1981, improving again afterwards.
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“The principle that human nature, in its psychological aspects, is nothing more than a product of history and given social relations removes all barriers to coercion and manipulation by the powerful.”
—Noam Chomsky (b. 1928)