|Certain truths about human beings have never changed. We are tribal creatures in our very DNA; we have an instinctive preference for our own over others, for "in-groups" over "out-groups"; for hunter-gatherers, recognizing strangers as threats was a matter of life and death. We also invent myths and stories to give meaning to our common lives. Among those myths is the nation — stretching from the past into the future, providing meaning to our common lives in a way nothing else can. Strip those narratives away, or transform them too quickly, and humans will become disoriented. Most of us respond to radical changes in our lives, especially changes we haven’t chosen, with more fear than hope. … If we ignore these deeper facts about ourselves, we run the risk of fatal errors. It’s vital to remember that multicultural, multiracial, post-national societies are extremely new for the human species, and keeping them viable and stable is a massive challenge.