How many years after the declaration of independence from Spain were the Dutch reunited with the Southern Netherlands in a constitutional monarchy,the United Kingdom of the Netherlands?
return the  declaration of independence from  Spain ;return the  Dutch were reunited with the     Southern Netherlands  in  a constitutional monarchy the   United Kingdom of the    Netherlands ;return year of #1 ;return year of #2 ;return difference of #3 and  #4
['select', 'select', 'project', 'project', 'arithmetic']