A question on democracy

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U.S.A is well - known to the world, it is a democratic country. People have to ultimate freedom to speak of their minds; and they have freedom to criticize when they see things unfairly. I absolutely agree on the essence of democracy on this point. Because of this politic work so well on the U.S. they also try to enforce it to the world to follow suit. Would it be work the same way on other country? For instance, Taiwan also follow the model of democracy from the U.S. the elected representatives were mostly from the Triad, gang members background. The same foot step follow by the Mexican upcoming election. My question is whether democracy would be work on every country on this earth?