Free institutions are next to impossible in a country made up of different nationalities.
 John Stuart Mill, Considerations on Representative Government (1861). copy citation

Context

“One hardly knows what any division of the human race should be free to do if not to determine with which of the various collective bodies of human beings they choose to associate themselves. But, when a people are ripe for free institutions, there is a still more vital consideration. Free institutions are next to impossible in a country made up of different nationalities. Among a people without fellow-feeling, especially if they read and speak different languages, the united public opinion necessary to the working of representative government can not exist. The influences which form opinions and decide political acts are different in the different sections of the country.” source