Which of these technological advances took place in the 1920s?

1920' was a decade of inventions and new technologies. In the time immediately after the First World War, people were eager for a happier life. Some of the technological innovations that have helped more enjoyment include radio, silent movies,  and auto industry Henry Ford.

There has also been progress in science and medicine. New immunizations, vaccines were invented, many diseases have become curable and the diet also changed, especially in America. Dietary habits have been introduced in humans, reduced calorie intake and fatty foods, and increased use of fruits and vegetables.

In addition, this is a decade of electricity, many homes, especially in developed industrial cities, used electricity in everyday household work, using refrigerators. cookers, washing machines, electric shavers, vacuum cleaners.

yes, there are senators in each state

the enslaved people onboard suffered from illness with some frequency