You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did seat belts become mandatory in usa?" whose answer is January 1, 1968.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did seat belts become mandatory in usa
Useful Output:

Doc 1: Washington State's first seat belt laws took effect in 1986. On January 13, 2002, being buckled up became a primary enforcement law.
Doc 2: It wasn't until 1959 in which Congress passed a law requiring all cars comply with certain standards of safety. By 1965 all states had laws
Doc 3: However, it wasn't until 1983 that drivers and their front seat passengers were legally required to wear them. In 1987, the law was updated so
Doc 4: Dole issued a rule in 1985 that required automakers to install driver's side airbags in all new cars unless—and this is the kicker—two-thirds of
Doc 5: In 1968, when seat belts became standard equipment, some drivers responded by cutting them out of their vehicles. In 1982, when Michigan State