Species interdependence in nature confers many benefits on the species involved, but it can also become a point of weakness when one species involved in the relationship is affected by a catastrophe.
If we want to avoid making similar mistakes in the future, everybody—especially the most intelligent and powerful—would do well to humbly acknowledge their own weaknesses.
Spurred by the advent of social historical methods, a new generation of historians found Unionists interesting as manifestations of the Confederacy's internal weaknesses.