The rule of law is important for democratic forms of government because if the law is the highest rule, then it applies equally to all, which makes all people equals in the eyes of law, which is the highest form of democracy. All people, regardless of looks or social backgrounds are responsible for things in the same way.
Height, length, and width. Or time, volume, depth. Or temperature, angle, and pressure.
I'm not sure if any were begun in 1775. The American Revolution was occurring at the time but it started in 1760's the sugar and stamp acts were in 1764 and 1765, While the Townsend act was in 1770. The declaration wasn't even started until 1817.