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In page History of Croatia:

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A new state was created in late 1918. Syrmia left Croatia-Slavonia and joined Serbia together with Vojvodina,[citation needed] shortly followed by a referendum to join Bosnia and Herzegovina to Serbia. The People's Council of Slovenes, Croats and Serbs (Narodno vijeće), guided by what was by that time a half-century-long tradition of pan-Slavism and without the sanction of the Croatian Sabor, merged with the Kingdom of Serbia into the Kingdom of the Serbs, Croats, and Slovenes.