How could we have the EU, or a similar entity, evolve into a fully united federal state by or during the start of the 21st century?
It must include the UK, and all nations in the OTL EU as of 2000 at least. Obviously if the time-line requires or resulting in different nations then real life, then some le-way is required (apart from regarding what ever nations inhabit Great Britain, which must be included).
Anyone got any ideas/willing to give a quick time-line?