This more or less goes along with a message from Banjer.

Wars are like earthquakes. Large movements build up slowly over time, in tectonic plate movement or cultural or commercial development, or in population movement and the like, which on the surface don't seem to make a lot of difference, but which build pressure and build pressure and build pressures which to most eyes are invisible. Eventually the pressures resulting from change result in such extreme differences in potential that something snaps, releasing huge and destructive forces that have built up.

Dave Oesterreich