He’ useless to ask whether the Venetians (confusing them with the citizens of the current Veneto Region) They have voted in free or not free 1866, because the international treaty (absent for other states Italian) he said this:
In other words, the very fact that in 1866 the Lombardy (territory occupied militarily by Italy but without legitimacy ) did not vote for annexation, invalidates a vote. In fact Lombardy then as now contained twice the population of Veneto and Friuli Venezia Giulia, thus failing the quorum and failing to fulfill the treaty, that can not happen if not for their own self-government, otherwise it is not free by definition.
I have already written these things in my book of 2007 that was part of the memories in court in Venice, and that led to the default Judgment Absolute Jurisdiction. Soon we ricomincieremo with this path ( unfortunately interrupted by a patrol of idiots) because Italy will force us to deny human rights .