It is "automatic" in the sense that the compiler generates the necessary prologues and epilogues in functions to set-up and restore the stack, to allocate local

It is "automatic" in the sense that the compiler generates the necessary prologues and epilogues in functions to set-up and restore the stack, to allocate local variables at certain frame offsets or in registers, and to free the programmer from dealing with that stuff. What is purely a widely used convention in assembly programming becomes a language feature. "Static memory" is just a named reference to a memory location in the program data section.