From WW I to the treaty of Trianon
When WW I began, Count Isvan Tisza was premier of Hungary. For the first two years of the war, Tisza managed to uphold the internal system and kept the country to its international course.
(Many Jews of the region were conscripted into the Hungarian Army including my father Alex and his brother Joseph Richter, who received a battlefield commendation)
When Francis-Joseph died Tisza persueded the new king Charles IV to accept coronation, which bound him to uphold the constitution and the integrity of Hungary. however, Charles also insisted on electoral reform, and this resulted in Tisza's resignation.
Minority governments (June 1917 to Oct 1918) struggled with increasing difficulties while agitation grew. The country began to listen to Count Mihaly Karolyi, leader of a faction of the Party of Independence, who said that independence from Austria, repudiation of the German alliance and peace with the entente - combined with social and internal political reform and concessions to the nationalities - would safeguard Hungary against all dangers.
When it became clear that the war was lost the opposition took the offensive. Popular demonstrations demanded the appointment of Karolyi as premier. To save bloodshed the king yielded and Karolyi took office at the head of a coalition government. The king renounced participation in affairs of state; parliament was dissolved and a Republic was proclaimed with Karolyi as provisional president. The appointment was confirmed on Jan 11th 1919; but with continued military setbacks unrest continued to
spread.
It was at this time that Bela Kuhn (said to have been a Soviet agent of Hungarian-Jewish origin) representing a coalition of Social Democrats and Communists siezed power (March, 1919). Kuhn failed to gain support among the Allies and his dictatorial internal policies alienated the bourgoisie. When promised support from, Communist Russia against Romania failed to materialize Kuhn was forced to flee (August, 1919) and the Romanian army occupied and looted Budapest.
A counterrevolutionary government was established with a national army under the command of Admiral Miklos Horthy de Nagbanya. This force entered Budapest (November, 1919) and a government was established under Minister-president Karoly Huszar. Units of the Counterrevolutionary army took violent and indescriminate reprisals against worker leaders and, as always, against Jews. (my father Alex and his brother Emil were suppposed to have been supporters of the Kuhn regime, and when it collapsed they fled the region, never to return). The new government established continuity by canceling Kuhn's and Karolyi's changes and formally dissolving the link with Austria. Hungary remained a kingdom and Admiral Horthy was elected Regent.