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.
Common-law marriage in the United States
Common law marriage, also known as sui juris marriage, informal marriage, marriage by habit and repute, or marriage in fact is a form of irregular marriage that survives only in eight U.S. states and the District of Columbia; plus two other states that recognise domestic common law marriage after the fact for limited purposes. It is arguably the original form of marriage, in which a couple took up residency together, held themselves out to the world as a married couple, and otherwise behaved as a married couple. It has been gradually abolished in Western nation states since the sixteenth century, when the Council of Trent in 1563 ruled that no marriage thenceforth would be valid in the eyes of the Roman Catholic Church unless it were solemnised by a priest. This ruling was quickly adopted in predominantly Roman Catholic countries, and eventually became the norm in Protestant nations as well. In 1753, the Kingdom of Great Britain passed Lord Hardwicke's Act, which provided no marriage in England and Wales was legally valid unless performed under the auspices of the Church of England, with exceptions for Jews and Quakers. The Act did not apply to Scotland or to the American colonies, and Ireland was still a separate country in 1753; so common law marriage continued in the future United States until individual states abolished it.