The verse that comes to mind is
Ye hear of wars in far countries, and you say that there will soon be great wars in far countries, but ye know not the hearts of men in your own land. D&C 38:29 (28-30)
This article compares and contrasts the world of today, with pre-WWI, complete with declining empires (US), raising powers (China, Far East), and powderkegs (Middle East).
War is coming. Right now, we are divided more strongly, and on more topics than ever before. We shall shatter in a millions tiny shards. There will be war, because there is no peace in the hearts of men. And if there is no peace inside, it is inevitable that peace outside of it will last long.