Indeed, the formation of nations and sovereign states--whether by fission or by fusion--may strengthen when an external threat becomes clearer, causing individuals to seek to unite with fellow-countrymen for mutual protection against the common threat.
Indeed, the formation of nations and sovereign states--whether by fission or by fusion--has historically been promoted by common external threats. A sense of belonging to a nation may strengthen when an external threat becomes clearer, causing individuals to seek to unite with fellow-countrymen for mutual protection against the common threat.