<P> After WWII the irredentism movement faded away in Italian politics . Only a few thousand Italians remain in Istria and Dalmatia as a consequence of the Italian defeat in WWII and the slaughter of thousands of Italians as reprisals for fascist atrocities, and the subsequent departure of approximately 400,000 people in what became known as the Istrian exodus . Roughly 350,000 refugees were ethnic Italians (76% of which born in the territories surrendered), the others being ethnic Slovenians, ethnic Croatians, and ethnic Istro - Romanians, choosing to maintain Italian citizenship . </P> <Table> <Tr> <Th_colspan="2"> Anniversary of Risorgimento </Th> </Tr> <Tr> <Td_colspan="2"> Monument to Italia Turrita in Reggio Calabria </Td> </Tr> <Tr> <Th> Observed by </Th> <Td> Italy </Td> </Tr> <Tr> <Th> Type </Th> <Td> National </Td> </Tr> <Tr> <Th> Significance </Th> <Td> Proclamation of the Kingdom of Italy on 17 March 1861 </Td> </Tr> <Tr> <Th> Celebrations </Th> <Td> Parades, Fireworks, Concerts, Picnics, Balls, Trade shows </Td> </Tr> <Tr> <Th> Date </Th> <Td> 17 March </Td> </Tr> <Tr> <Th> Frequency </Th> <Td> every fifty years </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Anniversary of Risorgimento </Th> </Tr> <Tr> <Td_colspan="2"> Monument to Italia Turrita in Reggio Calabria </Td> </Tr>

Describe the process of unification of italy in detail