Hitler, Mussoline and Franco stimulated the feeling of revanchism in their countries, making the citizens of each country see themselves as victims of other European nations that should be fought in the name of the honor of their homelands. With that, a great feeling of nationalism developed an imperialist position of the governments that, supported by the citizens, began to spread in smaller nations and to promote the suffering and the domination of other territories, creating the necessity that these territories defend themselves militarily, generating thus the second world war.
Explanation: The central theme of Ozymandias is the inevitable (unavoidable) ruin of leaders and empires. The message is that all leaders and the empires they build will always end up as nothing, however mighty they are.