Scotland became part of the Kingdom of Great Britain under the Acts of Union 1707 from 1 May 1707. It became part of the United Kingdom from 1 January 1801. Under the terms of the Act of Union 1707, Scotland was entitled to 45 members of the House of Commons of the Westminster Parliament. A Scottish law passed before the Union defined the constituencies for elections to the Parliament of Great Britain. There was a special provision for the selection of Members of Parliament for the 1st Parliament of Great Britain.