Check out Code of Federal Regulations/49/chapter 1/Part 172.
One of the ways in which the Apollo 11 flight plan could be seen as a historical document is if it is used as some kind of primary source. Technically, any document written in the past is a historical document.
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What one makes of all this will depend in part on how one understands the American political tradition. Many liberals view the rejection of liberalism as an alarming threat to "liberal democracy" — and American democracy, in particular — along with the institutions and values associated with it, which include representative government, the separation of powers, free markets, and religious liberty and tolerance. Their concerns are valid, insofar as some of liberalism's most vocal critics on the right and left indict the American political project and its founding as both misbegotten and irredeemably liberal.
I think that freedom of speech is considered natural rights
