Death rates in the 20th century deaths in the 1900s with a death toll between 40,000,000 and 85,000,000 deaths. Other predominate wars in the 1900s include World War I with up to 65,000,000 deaths, the Russian Civil War with up to 9,000,000 deaths, the Afghan Civil War with up to 2,000,000 deaths, and the Mexican Revolution with up to 2,000,000 deaths. Several other major wars took place in the 20th century, such as the Iran–Iraq War, the Soviet–Afghan War, the second Sudanese civil war, the Korean War and the Vietnam war. It is estimated that traffic collisions caused the death of around 60 million people during
American social dancing in the 20th century to big band music, while jazz dance was done to jazz music. The 20th century brought about a change in social dances. The "old fashioned and out of step" dances such as "the waltz and polka" needed to make way "for something different and new". In the past, only upper class dances had been recorded because lower class dances were "not deemed worthy of record". However, now in the 20th century, "the Industrial Age was upon us, a new middle class was emerging and great social ... innovations were on the horizon". The upper class even became more accepting of