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The Justinian Code has had limited influence of the legal system of America, Britain and other English-speaking countries. This is because they have a common-law tradition. This is based on the decisions of judges which provide a system of rules based on "precedent." When a judge makes a ruling which is legally enforced, it becomes a precedent: a rule that will guide judges in making subsequent rulings in similar cases. Therefore, instead of having a code or body of legislation, it exists only in past decisions. The Justinian Code, instead, has provided the foundation of the civil law systems of European countries. Civil law is based on a code or body of legislation which contains a comprehensive statement of rules, many of which are framed as general principles, to deal with any dispute that may arise. Courts in this kind of system have to look into the code and refer to previous rulings only to check for consistency. The Justinian Code has provided the guide for the creation of modern civil law because it was a very comprehensive compendium of Roman civil law. This made it very useful.
i hope that helped :)