The differing colours on this map show the percentage of support for the introduction of a republic in the 31 constituencies at the Italian referendum of 1946. A total of 54.3 % of the voters backed the new form of government and with it the abolition of the monarchy. Regionally, there were clear differences in the voting behaviour. Alto Adige (apart from a few municipalities) and the areas of Trieste didn't take part in the referendum.
derivative work based on:

File:Italian referendum 1946 support for republic.svg by Mai-Sachme
Mai-Sachme of the original, translation by Gigillo83