Death rates in the 20th century fever, polio, measles, hepatitis among others. However, war, genocide and Holocausts have led to many millions of deaths throughout the century, and late in the century AIDS had already killed millions, particularly in Africa and south-east Asia. Cancer also killed millions via lifestyle and pollution generated by increased work in factories. During the 20th century, an enormous improvement in public health led to an overall decrease in death rates. Infant mortality rates and maternal mortality rates have dramatically decreased. In the early 1900s, 6-9 women died in pregnancy-related complications for every 1,000 births, while 100 infants died before they were
American social dancing in the 20th century as swing dancing are still done, but are not necessarily well known or popular. Ragtime and jazz dance were both iconic dances of the 20th century. Both of them contained syncopated rhythms and dance steps that were very different from the polite and proper dance steps from centuries before. The new technology that came with the century made way for new ways of thinking, which in turn brought new music and exciting new dances. Ragtime music was at the height of its popularity from 1895 to 1918. Soon there were also dance moves created to go along with the music.