The United States order of precedence is a nominal and symbolic hierarchy of important positions within the government of the United States. The order is established by the President of the United States and can be changed at his direction. It has no legal standing and is instead used to dictate ceremonial protocol.
... it was adopted by the British Parliament in 1982 (though as part of the Canada Act (UK) 1982 it only became law in Canada, not the United Kingdom).
It is no acciden ...