There's a very big gulf between the black civil rights leadership in America and the black middle class in America. The black middle class are conservative. Many of those minorities can be persuaded to be members of the Republican Party.
Thompson and Ritchie were among the first to realize that hardware and compiler technology had become good enough that an entire operating system could be written in C and by 1978 the whole environment had been successfully ported to several machines of different types.
