Poser - any Scotsman should know the whole island is Britain and it's hard to be independent of your own island. Perhaps you are confused as to the southeastern part of Britain? They're called the "English".
Poster - any American should know the whole majority of the continent is USA and it's hard to be independent of your own majority of a continent. Perhaps you are confused as to the existence of this mythical independent Republic of Texas? And the Confederacy, that never happened either, because it is completely un-possible to have two separate, independent, sovereign countries in the same land mass. In fact that bullshit about the sovereign nation called the Vatican being right there in the same landmass as that other sovereign nation called Italy, well you DO know that's just a lie right?
A more appropriate analogy would be for Canada to become independent of North America, which would be a major civil engineering project.
Great Britain is an island that includes most of England, Wales and Scotland
The British Isles is a group of islands that includes Great Britain and Ireland (northern and southern)
The United Kingdom is a sovereign state that includes England, Wales, Scotland and Northern Ireland