It is recent and a first world problem people in tradtional tribal societies don't have chronic depression.shes right.

"Modern-day hunter-gatherer bands—such as the Kaluli people of the New Guinea highlands—have been assessed by Western researchers for the presence of mental illness. Remarkably, clinical depression is almost completely nonexistent among such groups, whose way of life is similar to that of our remote ancestors. Despite living very hard lives—with none of the material comforts or medical advances we take for granted—they’re largely immune to the plague of depressive illness that we see ruining lives all around us. (In perhaps the most telling example, anthropologist Edward Schieffelin lived among the Kaluli for nearly a decade and carefully interviewed over two thousand men, women, and children regarding their experience of grief and depression; he found only one person who came close to meeting our full diagnostic criteria for depressive illness.)"