sentences:  Due to this resurgence of Conservative ideology in the 1940s, Arciniegas felt that he and his family were in danger and moved to the United States, taking advantage of an offer to teach at Columbia University.He lived in New York for ten years (1947–57).At this time, he wrote his most important and most often banned book, "Entre la Libertad y el Miedo" (Between Freedom and Fear, 1952).