There were clauses condemning slavery in the first draft of the Declaration of Independence, but they were deleted because of the opposition of slave owners in the south, which shows the limitations of this declaration. Nevertheless, it is still a great political program, and its lines shine with the brilliance of criticism and creation, so it is called "the first declaration of human rights" by Marx. The Declaration of Independence not only inspired and promoted the bourgeois revolution in the United States and even European countries, but also laid a political foundation for the American Constitution that was born in the future.