statistics on official recognition of SLs?

[Mark A.Mandel]

The Wikipedia article "Minority languages" includes the paragraph (http://en.wikipedia.org/wiki/Minority_language#Controversy) 

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Signed languages are often not recognized as true natural languages even though they are supported by extensive research. In the United States, for example, American Sign Language is the most used minority language yet almost the only minority language which lacks official government recognition.[citation needed]
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How accurate are these statements? Can the paragraph and the article be improved with reliable and recent data?

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Mark A. Mandel
Linguistic Data Consortium
University of Pennsylvania



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