This is a comparative study of the two victorious revolutions of the Constitutional Iran and the Independence of the USA that lead to the all compassing internal motives of the two oppressed nations to fight against the despotism and oppression and to collapse the ruling political, economic and social order. It is true that the symbols and causes for revolutions are plenty, but this would not prevent from giving a pattern, in which the study of this role in the revolutions would be simplified. As existing despotism and oppression, government's inability to severe and complete depression of revolutionaries, as well as expansion of ideas, such as liberty among them have a fundamental role in providing the necessary and enough objective and subjective grounds for the revolutions, the role played by the rival great powers who were determined to compensate their already losses are influential too.
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