For how many years after the creation of the Orleans Territory did the Florida parishes east of the Mississippi remain part of the Spanish territory of West Florida?
return the  creation of   the     Orleans Territory ;return the  Florida  parishes east of   the     Mississippi did remain part of    the   Spanish territory of West Florida ;return year of   #1 ;return year of   #2 ;return difference of   #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']