Question

how have changes in seatbelts kept people safer? fill in the blan to explain. at first, seatbelts went across the lap only. then three - point seatbelts were invented. after, every seat in a car had to 1980 ind of seatbelt. 1958 1975 seatbelts in cars today keep riders even safer. by 1975, a law required that three - point seatbelts be put in the front seat of all new cars. after more studies, another law passed in 1980, and the belts were required in the back seat, too. these are the type of seatbelts you see in cars today

Explanation:

The text states that in 1975, a law required three - point seatbelts in the front seat of new cars. After more studies, in 1980, another law required them in the back seat too. So, after 1980, every seat in a car had to have this kind of seatbelt.

Answer:

1980