IN AMERICA, CHRISTMAS is an expansive holiday. At different times, to different people, it may be a joyous celebration of the birth of Jesus, a time for families to gather, an overwrought occasion tainted by materialism—or all of that at once. Whether or not you celebrate, it’s an unavoidable element of American culture, as photographer Lee Friedlander shows in a new book, Christmas. For more than seven decades, and in places as diverse as Honolulu, West Texas and upstate New York, Friedlander, 91, has documented what he calls “the social landscape”—stoops, storefronts, roadways—without bias. The camera, he once wrote, is “a kind of net. . .. The net is indiscriminate unless you point it and then are lucky. I might get what I hoped for and then some—lots of then…