(1932–1935) and the Saudi–Yemeni War (1934), as well as internal conflicts in Brazil (1932), Ecuador (1932), El Salvador (1932), Austria (1934) and Palestine (1936–1939). Severe famine took place in the major grain-producing areas of the Soviet Union between 1930 and 1933, leading to 5.7 to 8.7 million deaths. Major contributing factors to the famine include: the forced collectivization in the Soviet Union of agriculture as a part of the First Five-Year Plan, forced grain procurement, combined with rapid industrialization, a decreasing agricultural workforce, and several severe droughts. A famine of similar scope also took place in China from 1936 to 1937, killing 5 million people. The 1931 China floods caused 422,499–4,000,000 deaths. Major earthquakes of this decade include the 1935 Quetta earthquake (30,000–60,000 deaths) and the 1939 Erzincan earthquake (32,700–32,968 deaths). With the advent of sound in 1927, the musical—the genre best placed to showcase the new technology—took over as the most popular type of film with audiences, with the animated musical fantasy film Snow White and the Seven Dwarfs (1937) becoming the highest-grossing film of this decade in terms of gross rentals. In terms of distributor rentals, Gone with the Wind (1939), an epic historical romance film, was the highest-grossing film of this decade and remains the highest-grossing film (when adjusted for inflation) to this day. Popular novels of this decade include the historical fiction novels The Good Earth, Anthony Adverse and Gone with the Wind, all three of which were best-selling novels in the United States for 2 consecutive years. Cole Porter was a popular music artist in the 1930s, with two of his songs, "Night and Day" and "Begin the Beguine" becoming No. 1 hits in 1932 and 1935 respectively. The latter song was of the Swing genre, which had begun to emerge as the most popular form of music in the United States since 1933. Politics and wars Wars Colombia–Peru War (September 1, 1932 – May 24, 1933) – fought between the Republic of Colombia and the Republic of Peru Chaco War (June 15, 1932 – June 10, 1935) – fought between Bolivia and Paraguay over the disputed territory of Gran Chaco, resulting in a Paraguayan victory in 1935; an agreement dividing the territory was made in 1938, formally ending the conflict Saudi–Yemeni War (March 1934 – May 12, 1934) – fought between Saudi Arabia and the Mutawakkilite Kingdom of Yemen Second Italo-Ethiopian War (October 3,