sentences:  After Italian unification, predominantly supported by secular and anti-clerical forces, and especially the capture of Rome in 1870 which marked the final defeat of the Papal States by the Kingdom of Italy and gave start to the so-called Roman Question over the temporal power of the Pope, Catholics largely self-excluded themselves from active politics.As a result, all the main political parties and parliamentary groupings were secular in character until the early 20th century.In 1905 the Italian Catholic Electoral Union was formed in order to coordinate the participation of Catholic voters in the Italian electoral contests.