Written documents are useful in setting up a government because it is like proof.
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For a useful answer, choices are necessary here. However, some documents that are completely irrelevant to the development of the US Government include: the North Korean Constitution, War and Peace by Leon Tolstoy, the Charter of the African Union, UNGA Resolution 4468, Coca-Cola's Securities Reports, and whatever nonsense just came out of my printer.
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It is not a guide at all. It is the basic set of rules and Laws that tell how the Government may continue to create laws and enforce them. It is not a guide!!
Many former Presidents and government officials have worked for charity, as ambassadors, and in other useful roles. The government would like to support people who have already contributed to the United States so that they can continue to do so. People used to be able to get a much higher paying job in industry than the government so the government offered lucrative perks to recruit good people to government employment.