The correct answer to this open question is the following.
What showed the changing culture at the beginning of the 20th century was the invention of labor-saving machines. These new machines were well-accepted by consumers for the amount of time they saved in daily chores. We are talking about modern inventions such as vacuums that really helped the work in the home and the office. Another great invention was the washing machine, which saved tons of time. What about refrigerators? They change the way work was done in the kitchen. Canned food also revolutionized the industry of food in America.