Unable to find work as a writer, Beals took a job with
Standard Oil Company, but it did not suit him. In 1918, he spent a brief period of time in jail as a
World War I draft evader. Upon release, he decided to go see the world, and with what little money he had, Beals and his wife Lillian drove to Mexico. There, he founded the English Preparatory Institute in 1919, taught at the American High School during 1919 to 1920, and was on the personal staff of President
Carranza (1920). to write a series of articles. He became notable as the only foreign journalist who interviewed General
Augusto Sandino during Nicaragua's 1927–33 war against
US military occupation. In all, Beals wrote over 200 magazine articles Beals also wrote more than 45 books, including on history, geography, and travel. Some of his books are written for a juvenile audience. His autobiography,
Glass Houses, was published by J.B. Lippincott Company in 1938. His biography subjects included
Porfirio Díaz,
Huey P. Long,
Roberto de la Selva,
Stephen F. Austin,
John Eliot,
Carrie Nation, and
Leon Trotsky. During his career, Beals witnessed Mexican revolutions, lectured on Shakespeare, and was held incommunicado by a Mexican general. His travels took him to
French Morocco,
Tunisia,
Algiers,
Greece,
Turkey, the
Soviet Union,
Germany, and the
Caribbean. He was a
Ford Hall Forum speaker in 1936, and a member of the
American Committee for the Defense of Leon Trotsky in 1937. The following year,
Time magazine called Beals, "the best informed and the most awkward living writer on Latin America." ==Later life==