P. J. O’Rourke says we’ve worked ourselves into a state of anger and perplexity, and it’s no surprise because perplexed and angry are what Americans have been since the Roanoke Colony got lost. This astute and entertaining look at the state of these United States includes essays on everything from our fraught history (“Oh Beautiful for . . . Pilgrim Feet?”) to the political effects of social media, (“Whose Bright Idea Was It to Make Sure...