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| 1919, Jan. 11 |
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| Károlyi appointed president of the republic. The government at once proceeded to the work of dividing the large estates among the peasants. | 1 |
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| March 21 |
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| Károlyi resigned in protest of the Allied decision to assign Transylvania to Romania. | 2 |
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| March 21 |
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| Formation of a Socialist-Communist government under Alexander Garbai (president) and Béla Kun (foreign affairs). The Socialists were soon crowded out and a Communist dictatorship established under Béla Kun. | 3 |
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| March 28 |
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| Hungary declared war on Czechoslovakia and proceeded to the reconquest of Slovakia. | 4 |
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| April 10 |
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| Romanian troops began to invade Hungary to forestall reconquest of Transylvania. A provisional government was set up by Count Julius Károlyi (brother of Mihaly), Count István Bethlen, Adm. Miklós Horthy, and Archduke Joseph at Szeged (under French occupation). Beginning of the counterrevolution. | 5 |
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| June 24 |
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| Communist constitution. | 6 |
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| Aug. 1 |
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| Béla Kun fled to Vienna in the face of the Romanian advance. The Revolutionary Governing Council resigned. | 7 |
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| Aug. 4 |
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| The Romanians occupied Budapest (until Nov. 14). | 8 |
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| Aug. 6 |
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| Archduke Joseph took control as state governor but was forced by Allied protests to resign. A new government was formed under the industrialist István Friedrich. But chaos reigned. This was a period of “white terror” in which roving gangs of counterrevolutionary officers targeted socialists, radical democrats, and Jews. | 9 |
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