Catalonia is an autonomous community of Spain. At one point it was completely independent from Spain. During the years, calls for secession from Spain have occured. However, with the growing European debt crises, the secession movement is gaining ground in Catalonia. There is even a secession flag:
Last month over a million people marched in Bacelona(the largest city in Catalonia):
See compared to other parts of Spain, Catalonian is doing well financially. Catalonians are concerned that the wealth from Catalonia is being siphoned off to Barcelona and other parts of the country. They feel their wealth is being stolen from them. This problem will only get worse. As Spain becomes even worse financially, you could see a secession movement- already large in Catalonia- rise to fever pitch. What happens then? You will see turmoil in Spain and the face of Spain could be altered.
What about here in the United States? Similarly, some states are being fiscally responsible. Texas, Montana, and now Wisconsin have leaders that are taking their states into sound financial shape. On the other hand you have states like California and Illinois who are broke and running up their debt and future obligations to soon to be unsustainable levels. What happens then?
I suspect, you will see Illinois running to the Federal Government for financial bailout aid. What will Texas think about their federally collected tax payer money going to Illinois. Texans won't like it. There could be a day when you see masses of Texans rallying for secession.