of the Russian Revolution and the Russian Civil War, exacerbated by rail systems that could not distribute food efficiently, leading to 5 million deaths. Another severe famine occurred in China in 1928–1930, leading to 6 million deaths. The Spanish flu (1918–1920) and the 1918–1922 Russia typhus epidemic, which had begun in the previous decade, caused 25–50 million and 2–3 million deaths respectively. Major natural disasters of this decade include the 1920 Haiyuan earthquake (258,707~273,407 deaths), the 1922 Shantou typhoon (50,000–100,000 deaths), the 1923 Great Kantō earthquake (105,385–142,800 deaths), and the 1927 Gulang earthquake (40,912 deaths). Silent films were popular in this decade, with the 1925 American silent epic adventure-drama film Ben-Hur: A Tale of the Christ being the highest-grossing film of this decade, grossing $9,386,000 worldwide. Other high-grossing films included The Big Parade and The Singing Fool. Sinclair Lewis was a popular author in the United States in the 1920s, with his books Main Street and Elmer Gantry becoming best-sellers. Best-selling books outside the US included the Czech book The Good Soldier Švejk, which sold 20 million copies. Songs of this decade included "Are You Lonesome Tonight?" and "Stardust". During the 1920s, the world population increased from 1.87 to 2.05 billion, with approximately 700 million births and 525 million deaths in total. Social history The Roaring Twenties brought about several novel and highly visible social and cultural trends. These trends, made possible by sustained economic prosperity, were most visible in major cities like New York, Chicago, Paris, Berlin and London. "Normalcy" returned to politics in the wake of hyper-emotional patriotism during World War I, jazz blossomed, and Art Deco peaked. For women, knee-length skirts and dresses became socially acceptable, as did bobbed hair with a finger wave or marcel wave. The women who pioneered these trends were frequently referred to as flappers. The era saw the large-scale adoption of automobiles, telephones, motion pictures, radio and household electricity, as well as unprecedented industrial growth, accelerated consumer demand and aspirations, and significant changes in lifestyle and culture. The media began to focus on celebrities, especially sports heroes and movie stars. Large baseball stadiums were built in major U.S. cities, in addition to palatial cinemas. Most independent countries passed women's suffrage after 1918, especially as a reward for women's support of the war effort and endurance of its deaths and hardships. Politics and wars Wars Turkish War of Independence Greco-Turkish War (May 1919