What ideas justify that the first …

Giuseppe Mazzini was an Italian revolutionary. He was born in 1807. He became a member of the secret society of the Carbonari. When he was 24 years old, he was sent into exile in 1831 for attempting a revolution in Liguria. After that, he founded two more underground societies; first Young Italy in Marseilles and then Young Europe in Berne. Mazzini believed that God had intended nations to be the natural units of mankind. So Italy had to be forged into a single unified republic instead of being a patchwork of small state kingdoms. Following in the footsteps of Mazzini, many secret societies were set up Germany, France, Switzerland and Poland. The Conservatives feared Mazzini. 

While the conservative regimes were trying to consolidate their power, the liberals and nationalists continued to spread the idea of revolution. These people belonged to the educated middle-class elite; like professors, school teachers, clerks and members of the commercial middle classes.