Multiple system atrophy is a complex condition that is likely caused by the interaction of multiple genetic, environmental, and lifestyle factors. Some of these factors have been identified, but many remain unknown.
Mandatory Seatbelts According to the U.S. Department of Transportation, in July 1984, New York State passed the first mandatory seatbelt law in the nation, followed by New Jersey, Illinois, Missouri, Michigan, and New Mexico.
I remember having lap belts both front and back seats in the late 1960s but seat belts were an option that could be purchased on cars for many years. Nash offered them as an option in 1949. Ford offered them as an option in 1955. Front lap belts were mandatory in all american cars in 1965.