superstatesu‧per‧state /ˈsuːpəsteɪt $ -pər-/ noun [countable] 
a group of countries that are connected very closely politically, and who often act as if they were one country: 
He was totally against the idea of a European superstate.
a group of countries that are connected very closely politically, and who often act as if they were one country: He was totally against the idea of a European superstate.