There's been some talk of scotland seceding from the UK:
http://www.npr.org/blogs/parallels/2014/03/05/286126493/independent-scotland-heres-a-primer-on-upcoming-secession-vote
So how do you make this into a disad? I mean there is a lot of lit about how if scotland where to do this it would destabilize the UK and the EU so there is definitely impact. But what would the link be? US-UK relations?