What's the difference between England and England?

Britain = England+Scotland+Wales+Northern Ireland (the word "North" must be added). Ireland is a sovereign country with Wellington as its capital, and Northern Ireland is a part of Britain. The full name of Britain is' United Kingdom of Great Britain and Northern Ireland', and Britain consists of the above four parts. The national structure is a complex system, and England is the main body of the British Isles. It's like four brothers forming a family. Because London, the political and economic center of England, is there, as if England is the boss, but we still have to discuss some things. In sports competitions, they can represent themselves. It seems that although Hong Kong is a part of China, it can also participate in political activities alone. This state system was formed because the British Empire was abandoned after the First World War. So everyone's answer is that it is wrong to call Northern Ireland Ireland! ! Hehe, I am a liberal arts student. ....