Hmm, some examples? Scandinavia doesn't generally have strong nationalist identities. At least not of the jingoistic kind. They didn't devolve into tribal or clan based conflict.
Maybe it helps if the country in general is struggling with development, poverty, under-education etc. But then, those kinds of societies are generally at risk of any kind of dangerous ideology, be it of the right or left ring variety.
I'd also add that we'd need to distinguish between a strong national identity and nationalism.
I work with and go to Finland often and let me tell you they are very nationalistic. They fought hard for their independence of course and even it's not uncommon to see youngsters wear t-shirts with pictures of Finnish soldiers and the words 'thank you' underneath.
One of my best pals even bought new safety boots when his current brand were bought over by a Swedish company
