In November 1918, the county was officially abolished and incorporated in the provisional administrative region of Julian March. With the treaties of Rapallo and Saint Germain-en-Laye of 1920, the whole territory of the county became an integral part of the Kingdom of Italy. The former Habsburg policy favouring local autonomies was replaced by a strict centralism. The Province of Gorizia was established, which had very little self-government compared to the old county. The borders of the new province were also partially changed. The new province included some areas of the former Austrian Duchy of Carniola that were assigned to Italy by the Peace Treaty (the districts of Idrija, Vipava and Šturje). On the other hand, most of the territory in the Karst region, which had belonged to the County of Gorizia and Gradisca, was incorporated in the Province of Trieste, while the district of Cervignano was included in the Province of Udine.
