From my article, “The Republican Retreat to Identity Politics,”:
Historically, nations are held together by common memories, customs, symbols, myths and legends. In its most rigorous and consistent form, classical liberalism de-emphasizes or ignores these deep-seated cultural-symbolic underpinnings of civil society and attempts to secularize the public life, often migrating transcendence to the claims of the state. This creates a dangerous vacuum in which citizens find themselves without the basic building blocks of national cohesion. This inevitably results in human beings looking to their most basic and primitive bonds for cohesion, and thus reverting to a raw tribalism. A secular and materialistic society offers little scope for the type of roots that humans innately long for, with the result that the most plausible roots become race and ethnicity.