Inside U.S.A. is a nonfiction book by John Gunther, first published in 1947 and one of that year's best-selling nonfiction books in the United States. It describes the author's observations during 13 months of travel through the then-48 U.S. states beginning in November 1944. No. 1 on The New York Times Nonfiction best seller list for 6 weeks, from the issue of January 11, 1948. Wiki link