We are blessed to be citizens of a country enjoying record prosperity, with no deep divisions at home, no overriding external threats abroad, and history's most powerful military ready to defend our interests around the world. Americans of earlier eras may have hoped one day to live in a nation that could claim just one of these blessings. Probably few expected to experience them all; fewer still all at once. Our success is cause for pride in what we've done, and gratitude for what we have inherited. The most important matter is what we now make of this moment. Some may be tempted to believe...