At the beginning of the twenty-first century, some people placed signs with crudely painted skeletons holding cell phones near roadways, usually facing freeway ramps. These signs indicated disapproval of using cell phones while driving, a practice some states have now made illegal. As a result of this social movement

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Answer: As a result an informal norm has become a law.

Even before states had started making it illegal for people to drive while using cell phones, grouping of individuals had already stood against this practice. Thus, we can say that the social movement started at the beginning of the 21st century was what actually made this law come true.

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