Although alarmist headlines often announce imminent water wars over scarce resources, the truth is that cooperation over shared waterways, particularly rivers, is historically more common than conflict. In fact, even among bitter enemies, the historical record shows that water conflicts around the world do get resolved, even to the point that international cooperation often increases during droughts. However, common causes of water conflicts remain a concern. Unilateral actions to construct a dam or river diversion in the absence of a treaty or some other protective international mechanism are highly destabilizing to a region, often spurring decades of hostility before cooperation is even pursued. Similarly, as access to irrigation water is threatened, one result can be mass migrations of out-of-work, disgruntled people from the countryside to the cities—invariably a recipe for political instability.