 Authors such as Navascues, and the Basque-American Pete T. Cenarrusa, former Secretary of the State of Idaho, agree in stressing the influence of the Foruak or Charters of Biscay [Code of Laws in Biscay] on some parts of the US Constitution.John Adams traveled in 1779 to Europe to study and compare the various forms of government then found on the Old Continent.The American Constitution was approved by the first thirteen states on 17 September 1787.