Certainly this island can qualify as having one of the world's longest-running governmental love since 1648 the French and the Dutch have shared sovereignty in almost total harmony.
The government has been democratic since 1648.  
mnli hypothesis: The government has been democratic since 1648.   premise: Certainly this island can qualify as having one of the world's longest-running governmental love since 1648 the French and the Dutch have shared sovereignty in almost total harmony.