Kingdom of Sardinia (Piedmont) of the rest of Italy. After the latter was unified under the Savoy kings, following the political lines of moderates such as Camillo Benso di Cavour, the Republicans remained aside from the political life of the new country, proclaiming their abstention from elections. They created several democratic movements, like the Brotherhood Pact of Workers' Societies, founded by Mazzini in 1871. However, Mazzini's death the following year and internationalism put the Republicans in a difficult position. In the run-up of the 1880 Italian general election, the Republicans chose to abandon abstentionism. At the time, their ranks included both members of the middle class, such as Giovanni Bovio, Arcangelo Ghisleri and Napoleone Colajanni, as well as the working class, such as Valentino Armirotti. The PRI, whose power base was limited to Romagna, Umbria, Marche, the Tuscan littoral and Lazio, all but Tuscany former Papal States territories, was officially founded in 1895. By the end of the century, the party was allied with the Italian Socialist Party (PSI) and the Italian Radical Party in several local governments, including Milan, Florence and Rome. Early 20th century At the outbreak of World War I, the PRI sided with interventionists, aiming at supporting France (considered the motherland of human rights) and annexing Trento and Trieste (then part of Austria-Hungary). After the end of the conflict, the party tried to form an alliance with other left-wing parties, but the attempt failed as the PSI at was strongly influenced by its "maximalist" (radical) wing. In 1921, Pietro Nenni left the PRI to become one of the leaders of the PSI. In the 1920s, the rise of the National Fascist Party (PNF) caused the collapse of all Italian left-wing parties, including the PRI, which was banned in 1926. Several Republicans were arrested, confined or exiled and the PRI collaborated to the anti-fascist struggle. In 1927, the party joined Anti-fascist Concentration. In the late 1930s, it also participated in the Spanish Civil War. In 1940, the German occupation of France, where many Republicans had taken refuge, put the party in jeopardy. During the armed resistance against the German occupation of Italy from 1943, PRI members were part of the provincial National Liberation Committees (CLN), but they did not participate to the national CLN as they did not want to collaborate with Italian monarchists, some of whom were active members of the committee. Post-World War II In