The Justinian Code swept through Europe, influencing the legal systems of every country with the exception of England. Ahead of Europe in legal thinking, Henry I and Henry II had modified the old Germanic legal system into a code of Common Law that was strong enough to withstand the influence of the new code. The Common Law system of England became the legal system of the United States after the Revolutionary War in all states except one. Louisiana adopted the Justinian Code, because the state's legal system was established during the time when the territory was under French rule.
Today most of the world uses The Justinian Code, with the exception of England and its former colonies.