What is the Differences between British Devolution and American Federalism?

-In the US, the States have Sovereignty by the USCON which Guarantees their Powers. In Britain, the Devolved Parliaments exist as a result of a Parliamentary Statute, which can be revoked at any time -The Judicial Nature of the USCON allows States to challenge the Federal Government. In Britain, this is also possible, though, the Lack of Sovereignty of the UKSC can make their rulings ignored. -Powers of the Devolved Bodies are not Equally Shared. Each Body has its powers. But in the States, they are all Equal and Powerful.