In Old England, before the settlement of the United States, case law was the most prevalent source of law. This was in contrast to countries that followed the Roman Law system, which primarily relied on written codes of conduct enacted by legislature. Case law in England was mired in tradition and local customs. Societal principles of law and equity were the guidelines when courts issued their rulings. In an effort to be consistent, English judges made it a policy to follow previous judicial decisions, thereby creating a uniform system of laws throughout the country for the first time. Case law was named common law because it was common to the entire nation. 1
The English system of jurisprudence made its way to the United States with the original colonists. Initially, the thirteen colonies unanimously adopted common law as the law of the land. All crimes were common-law crimes, and cases determined criminal elements, defenses, and punishment schemes. Gradually, after the Revolutionary War, hostility toward England and modern reform led to the erosion of common-law crimes and a movement toward codification. States began replacing common-law crimes with statutes enacted by state legislatures. Oxford professor Sir William Blackstone’sCommentaries on the Law of England, which interpreted and summarized English common law, became an essential reference as the nation began the process of converting common-law principles into written statutes, ordinances, and penal codes. 2
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