The correct answer is: He's trying to inspire patriotism in his people.
Mussolini is refering to Italy. Countries are made by it's people so he is talking to all the people that are identified as Italians. We can see he speaks directly to them in some phrases like: "...rise to your feet; let the cry of your determination rise to the skies and reach our soldiers in East Africa.". Although he mentions East Africa and the enemies, he doesn't justify or explain any of those, he wants people to rise and encourage fear on the enemy and to support the soldiers. He knows that without the support of the people, Italy won't be able to achieve anything. Mussolini inspires love and loyalty for Italy and the facist movement, in other words, patriotism.
