The growth of suburbs in the 1920s encouraged the government to spend money on with federal money, making it the biggest budget expenditure by the end of the decade.

 The correct answer is  :  highways

Explanation:  Public transport and cars are technological advances that helped the growth of the suburbs in the 1920s. The suburbs changed the society of the United States because they created new industries such as: drive-through resturants, shopping malls, country clubs.

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.