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.
Early cars had no seat belts. In the 1930s, doctors began installing seat belts in their cars, realizing that accidents were increasing along with cars' speed and popularity. In 1955, California was the first state to require cars to have seat belts installed before sale. This became U.S. law in 1968.