The United Kingdom: Four Nations, One Sovereign State

Yes. The United Kingdom of Great Britain and Northern Ireland is a sovereign state composed of four constituent countries:

• England — largest by population and economy; capital: London
• Scotland — distinct legal, education, and church systems; capital: Edinburgh
• Wales — devolved legislature (Senedd); capital: Cardiff
• Northern Ireland — devolved assembly (Stormont); capital: Belfast

"Great Britain" refers to the island containing England, Scotland, and Wales. The UK includes all four. Each has varying degrees of devolved power over health, education, transport, and justice, while foreign policy, defense, and monetary policy remain with the UK Parliament in Westminster.

This union evolved over centuries: England/Wales (1536), England/Scotland (1707), Great Britain/Ireland (1801), with most of Ireland leaving in 1922 (Irish Free State), leaving Northern Ireland in the UK.