Throughout the world you can find couples of nations (e.g. Sweden - Finland, Sweden - Norway, Germany - Austria, Czech Republic - Slovakia, Poland - Lithuania, Spain - Portugal) who have spent considerable portions of their history within a common state or in otherwise close relations. Typically, the more populous and/or advanced nation dominates the relationship and its junior partner. Time passing, smaller nations tend to evolve, secede and/or establish their own nation-states. Many of them struggle with stepping out from the "shadow" of their "Big Brother" and, competition opportunities being various and numerous, rivalries occur.Sports is no doubt the most popular arena, however, rivalry patterns may be applied in politics. The Little/Big Brother complex is likely to complicate cooperation among nations in question.
How much?
What strategies are employed to overcome it?
Is there any research/theorizing done?
Thanks! .