Visible crew/equipment: When the O'Hara family does their prayer you see two boom mike shadows on the ceiling. (00:14:15)
Visible crew/equipment: When Mammy catches Scarlett trying on a pretty bonnet when she is supposed to be in mourning, when the camera pans wide to show the room, in the mirror on the wall behind Scarlett you can see the shadow of the grip holding the mic above Scarlett.
Answer: To answer your question, I looked for on-line versions of the "Gone with the Wind" screenplay. What you are hearing as "other 48 states" is actually "those fool Yankees." The full line is, "Y'know, those fool Yankees actually want a war?" Also, the line is actually said by Stuart Tarleton, played Fred Crane, not by George Reeves as his twin brother, Drew. In writing, it doesn't seem they would sound alike. When I watched the opening scene of "gwtw" on YouTube (https://www.youtube.com/watch?v=ymbmvQJcLDc&t=6s), I can see how the error was made. I might have misheard it, as well, if I didn't already know what the line was from my research. Mr. Crane's enunciation is rather muddled.
George Reeve plays Brent Tarleton, not "Drew."