No, in fact Helen Keller's teacher (Annie Sullivan) also successfully taught a girl who had the same problems that Helen did around that time. I don't know if it was before or after Annie taught Helen.
I'm sure there have also been other girls that have been the same; we just don't hear about them because their stories aren't as popular.
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No there were many people left deaf and blind before her. Such as Laura Brigdman. But Helen Keller was the first blind and deaf woman to go to college. (she went to college at Radcliffe university)
No, Helen Keller was not the only blind and deaf girl. There have been other individuals who have also been blind and deaf, such as Laura Bridgman, who was the first deaf-blind person to be educated in the United States before Helen Keller.
she was not the only person who was blind and deaf but she was the first blind and deaf person to read, write, and even talk!