1. American Sign Language (ASL) developed from various sign languages used in America and France and became the dominant sign language in the United States.
2. ASL has its own grammar and syntax distinct from English, though it borrows some elements from English. It originated from home sign languages and a sign language used on Martha's Vineyard with a high rate of deafness.
3. In the late 1800s, there was a debate between oralism versus manualism in deaf education, with oralists opposing the use of sign language. It was not until the 1950s that ASL was established as a true natural language.