One World is a manifesto and travelogue written by Wendell Willkie, a liberal Republican, about his seven-week, 31,000-mile tour. Originally published in April 1943, it advocates for an end to colonialism, and promotes both world federalism and equality for non-whites in the United States. No. 1 on The New York Times Nonfiction best seller list for 12 weeks, from the issue of April 19, 1943. Wiki link