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.
A 1973 study suggested that three-point (lap and shoulder) seat belts were more effective and less risky than air bags anyway. But as air-bag technology improved, automakers began to install them in more and more vehicles, and by the time the 1991 law was passed, they were a fairly common feature in many cars.