Why do you think English common law became the most important basis of the American legal system?

Answer: because it was the main source in England for hundreds of years

Explanation: The most important influence on the American legal system is English law. The English system of common law is based on court decisions rather than on a legal code ... Because it is based on the decisions of judges, common law is considered judge-made law. It was the main source of laws in England for hundreds of years.