What will he become? (Photo by David Silverman/Getty Images)

The latest cycle of violence in Israel-Palestine might appear to be over, but a pivotal dimension of the conflict remains unresolved: the matter of population. The Israelis and Palestinians are not only engaged in a never-ending territorial struggle, but a demographic one, too.
Israel-Palestine is a distinctive region because it combines low infant mortality and high female education with high birth rates. As Paul Morland has pointed out, Jews and Arabs in the region have much higher birth rates than their “co-ethnics” outside it. For instance, Arab women in Jordan bear 2.69 children, while those in Palestine have 3.49; Jewish women in Israel average 3.17 children each, compared to 1.5 in the US and Britain.
Why is this? One explanation seems to be that birth rates are higher in regions of religious conflict — a hypothesis that also seems to map on to areas inside Israel-Palestine. For example, Arab women in relatively conflict-prone Gaza average 3.64 kids compared to 3.07 in the more peaceful West Bank. Jewish women in tense, religious Jerusalem average 4.27 compared to a national average of 3.17.
What’s particularly concerning, though, is how these high fertility rates further increase the risk of violence, producing a dangerous, combustible spiral. How so?
First of all, political demographers have long identified a relationship between population composition, politics and violence. Young men, due in part to testosterone, commit a vastly disproportionate share of murders in all societies. Indeed, statistical models show that the higher the share of a nation’s population made up of 15-30 year olds, the greater the risk of a violent conflict.
In Sons and World Power, Gunnar Heinsohn analysed this trend throughout history, arguing that surplus males have always played an important part in spurring conquest and aggression. When only the eldest son inherited land, those with the bad luck to be his siblings had to fend for themselves. And so, he explained, during periods when population growth exceeded peaceful economic opportunities, war, banditry and risk-taking became more attractive.
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