American Legal English

I started to read "American Legal English.", it is introduction to the U.S. legal system. I read about a common law system, which means that the role of case law in the system is different from that in most countries where civil law is the legal system. Also I read about the U.S. Constitution and the sources of U.S. Law. It quite difficult to follow but it needs rereading to understand, so I will continue reading.