Is this question even in the right forum section :U?
If we were to look at a PoD before 1900, that requires Italy to faired better against the Austrians during the Austro-Prussian War in which Italy received Lombardy-Venetia. Though they did have plans on Dalmatia and Trieste, the Italians were hampered by the integration of the Sicilians into the armed forces, some of whom were antagonistic towards the Italians for the annexation of the Two Sicilies. The Italians did very poorly and Austria, rather than cede it to them, gave it to the French to then give to the Italians as a gift, a rather humiliating proposition which they amended by holding a plebiscite to which the Venetians voted in favor of annexation. Had they done better, then maybe those areas might be won by Italy.