Hungarian_Republic_(1919–1920)--Emperor_of_Austria_Charles_I

The Hungarian Republic (Hungarian: Magyar Köztársaság) was a short-lived republic that existed between August 1919 and February 1920 in the central and western portions of the former First Hungarian Republic (controlling most of today's Hungary and parts of present-day Austria, Slovakia and Slovenia). The state was established in the aftermath of the Hungarian–Romanian War by counter-revolutionary forces who sought to return to the status quo prior to 31 October 1918.Following this period, the Allies of World War I severely pressured the Hungarians into retreating behind post-war demarcation lines as a provision to the Paris Peace Conference of 1919, which was the Allies' attempt to establish new nation states among the former kingdom's non-Hungarian citizens, the principal beneficiaries of which were the Kingdom of Romania, the Kingdom of Serbs, Croats, and Slovenes, the Austrian Republic, and the Czechoslovak Republic. Subsequently, the Republic was transformed back into the Kingdom of Hungary, which signed the Treaty of Trianon under protest.