Here's why:
* Sign language is an ancient form of communication: It likely emerged independently in different parts of the world as a natural way for deaf people to communicate.
* No written records: There are no written records from ancient times detailing the specific origins and development of sign language in different cultures.
* Evolution and variation: Sign languages are constantly evolving and adapting over time. What we might call a "sign language" today could be a vastly different system from its origins.
However, we do know:
* Ancient civilizations: Deaf people have existed throughout history, and there's evidence suggesting forms of sign communication were used in ancient civilizations like Egypt, Greece, and Rome.
* Modern sign language: While the exact origins are unknown, modern sign languages have been studied and documented for centuries.
In summary: While we can't pinpoint the first country to use sign language, its origins likely predate written records and are deeply intertwined with the history of deaf communities worldwide.