Hi there, sorry for the late answer!
First of all, lets review what "Unification" is.
Unification is the process of joining parts together into a whole; in national unification, diverse regions are brought together as one nation.
The factors that helped the unification in Italy were..
Geography (Italy is isolated. The alps are to the north, and they are surrounded by oceans), History(Italians are very proud of their heritage, including the Italian Renaissance), and the Efforts of 3 men (Mazzini, Garibaldi, Cavour).
Factors that encouraged German Unification were because they could not persuade parliament, they were aligned with Austria to attack Denmark for Schleswig and Holstein, and had a quick victory increasing Prussian nationalism.
