List of national legal systems
Common law is currently in practice in Ireland, most of the United Kingdom (England and Wales and Northern Ireland), Australia, New Zealand, Bangladesh, India (excluding Goa), Pakistan, South Africa, Canada (excluding Quebec), Hong Kong, the United States (on a state level excluding Louisiana), and many other places. In addition to these countries, several others have adapted the common law system into a mixed system. For example, Nigeria operates largely on a common law system, but incorporates religious law.
Civil law (legal system)
Civil law is primarily contrasted with common law, which is the legal system developed first in England, and later among English-speaking peoples of the world. Despite their differences, the two systems are quite similar from a historical point of view. Both evolved in much the same way, though at different paces. The Roman law underlying civil law developed mainly from customary law that was refined with case law and legislation. Canon law further refined court procedure. Similarly, English law developed from Anglo-Saxon customary law, Danelaw and Norman law, further refined by case law and legislation. The differences are