I dunno. I think the EXACT shape of the fender stratocaster is a little different. Im not a guitar player so i don’t get as picky about these things. But the generic american shape of the modern guitar was invented by gibson. The fender telecaster is the generic american shape. The gibson super 400 came out in the early 1930s, while the telecaster came out in about 1950, the stratocaster 1954.
http://en.wikipedia.org/wiki/File:Super400ces.png
telecaster:
http://en.wikipedia.org/wiki/File:FenderTelecaster.jpg
In addition to those is the gibson les paul(1952), and the gibson SG(1961)
Gibson was first.
I don’t think it has to do with solid-body, more of the shape.