D Roosevelt took a commuter approach towards passing legislation that would help he nation recover from the Depression
After the war peaking in 1946
Well most of the concepts in these documents were prevalent in previous society's. Representative democracy in Athens. Basic inalienable rights was in the English Bill of Rights. But a big change was the checks and balances of government. i.e how the president can veto congress, the Supreme Court can overturn a veto, and Congress can impeach Supreme Court judges.
A letter from a soldier who fought in the Napoleonic Wars is considered a primary source.