a ČSR; boundaries and government established by the 1920 constitution.
b Annexed by Nazi Germany.
c ČSR; included the autonomous regions of Slovakia and Subcarpathian Ruthenia.
d Annexed by Hungary (1939–1945).
e ČSR; declared a "people's democracy" (without a formal name change) under the Ninth-of-May Constitution following the 1948 coup.
f ČSSR; from 1969, after the Prague Spring, consisted of the Czech Socialist Republic (ČSR) and Slovak Socialist Republic (SSR).
g Oblast of the Ukrainian SSR.
h Oblast of Ukraine.