Eisenhower on War
There were a few short periods of time in history when it appeared that humankind might avoid the fate of never-ending war. The years that followed both the world wars of the 20th Century are probably good examples.
At this point, however, war has become the paradigm by which international tensions are resolved, whether or not they are driven by religious fanaticism. With climate change bringing on increased scarcity of our natural resources, this can only be expected to rivet itself into place.
As Dwight Eisenhower noted, however, war comes at a cost that is far higher than simply the physical casualties.