How did Roman laws influence US laws?

The US legal system is a "common law" legal system which is based on law that is developed by judges through decisions of the courts, and is often contrasted to "civil law" systems which are more closely derived from Roman laws. One of the main similarities between common and civil legal systems is the systematic division of the law into property, contract, and tort. Therefore it could be said that this systematic division is likely the main influence of Roman laws on US law.