Although Einstein was born in Germany, he fled the country in 1933 when Hitler came to power. Actually, he was already here in the USA and wisely decided not to go back. He was Jewish (by ancestry although not particularly religious) and had no intention of going back to the antisemitism that was becoming the face of Germany. He was granted U.S. citizenship in 1940, and spent the last couple of decades of his life working in and for the USA. Much of his great work, notably his later work, was performed in the USA. Therefore, many people simply regard him as American--especially since, at the end of his life, he certainly was. Well duh? Deaf people all over the world use sign languages. Each culture tends to develop its own and today more than 100 are recognized. Some African languages still incorporate bird calls and other sounds of the forest. When Jean Auel began writing her "Clan of the Cave Bear" series of novels, the prevailing notion was that the Neanderthal brain did not have a speech center. So she invented a rich sign language for the Neanderthal characters in her books. Communication was the problem that kept the Neanderthals and the recently arrived Homo sapiens at odds with each other. However, more sensitive instruments have been developed. It was recently determined that the Neanderthal skull did indeed have a place for a speech center, almost identical to ours.