1. Fascism thrives in militaristic societies. World War I caused a tremendous militarization of a number of countries. Nations like Italy and Germany saw the need to be able to quickly mobilize millions of people to fight wars and provide economic support.
2. Fascists reject liberal democracy, which is basically a representative kind of government where elections are free and competitive, powers between different government branches are separated, and people have more or less equal rights, freedoms and protections under the law.
3. Fascists, on the other hand, prefer totalitarian one-party rule, led by a strong leader (your favorite dictator). This allows the fascist country to have unparalleled national unity of purpose, a very ordered society, generally ready for armed conflict. Such a society is also poised to respond quickly to economic measures, especially in time of difficulties. A fascist country will likely isolate itself, blaming the international economic order for its troubles.