With the establishment of Czechoslovakia in 1918, Slovak became an official language for the first time in history along with the Czech language. The Czechoslovak Constitution of 1920 and the constitutional law on minorities which was adopted alongside the constitution on the same day established the Czechoslovak language as an official language Since the Czechoslovak language did not exist, the law recognized its two variants, Czech and Slovak. Czech was usually used in administration in the Czech lands; Slovak, in Slovakia. In practice, the position of languages was not equal. Along with political reasons, this situation was caused by a different historical experience and numerous Czech teachers and clerks in Slovakia, who helped to restore the educational system and administration because Slovaks educated in the Slovak language were missing.