This statement is generally **true.** Horticultural and plow-agricultural societies tend to engage in warfare less frequently than hunter-gatherer societies. This is because hunter-gatherer societies often engage in conflicts over limited resources, while horticultural and agricultural societies are more likely to have a stable food supply due to farming, which can reduce the frequency of resource-related conflicts. However, it's important to note that there is no one-size-fits-all answer, and the prevalence of war can still vary widely within and among different societies.