The capture of Rome, September 20, 1870, causes the annexation of the city to the Kingdom of Italy, and the decree ending the existence of the Papal States and the temporal power of the Popes, which will trigger the so-called controversy of the "Roman question" (which will be settled only with the signature ofLateran Accords in 1929).the following year, the capital of Italy is transferred from Florence to the "Eternal City" by Law No. 33 of February 3, 1871.