Czechoslovakia is proclaimed an independent republic in Prague. The former Upper Hungary of the Austro-Hungarian state, inhabited mostly by Slovaks, unites with the Czechs into a single Czechoslovak state.
Editors. "Slovakia becomes part of Czechoslovakia". The Literary Encyclopedia. First published 01 May 2009
[http://www.litencyc.com/php/stopics.php?rec=true&UID=7156, accessed 02 April 2015.]