The unification of the four British nations (England, Scotland, Ireland, and Wales) into one nation has been a major topic in all four since the destruction of the United Kingdom by the French Empire in the 1810s. The issue died out by the 1850s as nationalism grew strong in each nation, and the formation of the Celtic Alliance (Scotland, Wales, Ireland) further separated them from the cause. After the Fourth World War, the idea took hold in England in the form of the British Union Party, which gained a massive foot in the English Parliament until the Mosley-led faction began to replace it during the time leading up to the Fifth World War. The Irish Republic formed in the aftermath of the Irish revolution also supported such a union, although the Fifth World War shattered all hopes of a union. Supporters of the movement still exist today in each nation.