The similitary between Germany, Italy, Japan and Russia is that they were all totalitarian governments, or governments in which the people are restricted in their freedoms and the government has total control. The differences of course, were that Russia was Communist; Japan Imperialist; and Germany and Italy Fascist.
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The three countries were similar in that they were all unhappy with the outcome of the Treaty of Versailles and they wanted to gain more territory. They were all militaristic, in regards to gaining more territory and had fierce leaders who could carry out these plans. Each government morphed into a Dictatorship of sorts and allowed the countries to gain power as well.
They were all Socialists. Hitler's NAZI party is properly termed "National Socialist", while Marxism is International Socialist. Mussolini's Fascist party was more corporate socialism. But in each case, the State is the final arbiter of all things and the one that makes all the decisions.
Socialism is inherently flawed, because in requiring the State to make all the decisions, the State never has enough knowledge to make those decisions. In Capitalism, the State doesn't make all - or even a majority of - the decisions. Individual people, separate companies and different organizations each make their OWN decisions, and in most cases, the individuals know more about the local conditions than the State does.
"Socialism, like the ancient ideas from which it springs, confuses the distinction between government and society. As a result of this, every time we object to a thing being done by government, the socialists conclude that we object to its being done at all. We disapprove of state education. Then the socialists say that we are opposed to any education. We object to a state religion. Then the socialists say that we want no religion at all. We object to a state-enforced equality. Then they say that we are against equality. And so on, and so on. It is as if the socialists were to accuse us of not wanting persons to eat because we do not want the state to raise grain."
Frederic Bastiat, "The Law"