On 25th July 1603 King James VI of Scotland was crowned King James I of England, sparking many of the ongoing resentments about Scottish power in England and English power in Scotland that are continuing to this day.
On 25th July 2008, Labour lost to the Scottish Nationalist Party in the Glasgow East by-election, giving the Scottish independence movement a handy boost.
405 years with the same rulers – and 301 years since the Act of Union brought the two countries together as one – and yet Scottish/English national identity is as strong as ever. The only difference? We no longer invade and kill each other when we get miffed.
Lesson learned? Political union is great.