Common law
The common lawso named because it was "common" to all the king's courts across Englandoriginated in the practices of the courts of the English kings in the centuries following the Norman Conquest in 1066. The British Empire spread the English legal system to its historical colonies, many of which retain the common law system today. These "common law systems" are legal systems that give great precedential weight to common law, and to the style of reasoning inherited from the English legal system.
Zephaniah Swift
"Zephaniah Swift was a pioneer in development of an American common law distinct from England." During the colonial era, it was common to follow precedents from English courts. "In 1795, Swift wrote the first text on American law, called 'A System of Law,' which stated what in his opinion the common law of Connecticut was, based on what Connecticut judges were actually doing. It was a radical departure from English precedents, and was an appropriate departure too if the 'Revolution' was to have practical meaning."