How did the use of machines change the workers' jobs?

The advancement in technology helped to make the workers job easier in American society. A perfect example of this would be the assembly line. The assembly line is a collection of machines and workers that help to mass produce goods.

In American society during the early 20th century, this process became an everyday part of the working life. This resulted in workers only having to master a task or two rather than several tasks they would have to master if they made the goods themselves. This all helps to lead to increased productivity and efficiency in the workplace. Along with this, it results in specialization, which is the idea that workers should focus on developing their talents in one specific area rather than trying to be mediocre in multiple areas.

The answer is ethnic groups.