legal systems of the world

what is the key differance between a common law system and civil law system? common Law is created through judicial reasoning in court whereas civil law is created by professors not through judgements what were the two keys works of civil law? justinians institute corpus iuris civilis what countries are part of the common law world (generally) any country that was part of the British empire - traces its origins back to the English system what counties are part of the civil law world (generally ) any country outright the British empire but was part of another european empire how did the civil law world come about? basically the common law of Europe it was so because of unifying forces such as the church and the holy roman empire which did not control them but many countries paid homage tot hem anyway