Most former studies of divided nations were focused on the relations between the imperial nations themselves or between the divided parts of a nation, and their criteria to select divided nations to study was not consistent.
This is a study of nine...
Most former studies of divided nations were focused on the relations between the imperial nations themselves or between the divided parts of a nation, and their criteria to select divided nations to study was not consistent.
This is a study of nine nations divided during the twentieth century focusing on the relations between the imperial nations and their colonies. The nine divided nations are classified into four groups based on their processes to be divided: nations whose division was mainly caused by their colonial heritage of the imperial nation's "divide and rule" policy(India), nations divided mainly because of their partial independence from their colonial status(Ireland, Mongol), new nations built by imperial nations from small parts of nations(Panama, Yemen), and nations divided as results of wars(China, Germany, Vietnam, Korea).
Though the nine nations' processes of division were different, and the causes of their division may be many, there was a common cause of the nine division, that was the intervention by imperial nations. Therefore the necessary condition to reunite the divided nations could be their independence from imperial nations.