The Imagined Community is the concept strongly supported by Benedict Anderson which states that a nation is socially constructed and ultimately imagined by the people who perceive themselves as part of that group. The main causes of the nationalism that derives from the imagined community are the reduction of privileged access to particular script languages (such as Latin), the movement to abolish the ideas of divine rule and monarchy, as well as the emergence of printing press capitalism - all phenomena occurring with the start of the Industrial Revolution.

"It is imagined because the members of even the smallest nation will never know most of their fellow-members, meet them, or even hear of them, yet in the minds of each lives the image of their communion. . . . The nation is imagined as limited because even the largest of them, encompassing perhaps a billion human beings, has finite, if elastic boundaries, beyond which lie other nations. No nation imagines itself coterminous with mankind. The most messianic nationalists do not dream of a day when all the members of the human race will join their nation in the way that it was possible, in certain epochs, for, say, Christians to dream of a wholly Christian planet. It is imagined as sovereign because the concept was born in an age in which Enlightenment and Revolution were destroying the legitimacy of the divinely-ordained, hierarchical dynastic realm. Coming to maturity at a stage of human history when even the most devout adherents of any universal religion were inescapably confronted with the living pluralism of such religions, and the [direct relationship] between each faith's ontological claims and territorial stretch, nations dream of being free, and, if under God, directly so. The gage and emblem of this freedom is the sovereign state. Finally, it is imagined as a community, because, regardless of the actual inequality and exploitation that may prevail in each, the nation is always conceived as a deep, horizontal comradeship. Ultimately it is this fraternity that makes it possible, over the past two centuries, for so many millions of people, not so much to kill, as willingly to die for such limited imaginings."

References

Benedict Anderson. Imagined Communities ISBN 0860913295