When the FCC was authorizing clear channel stations in the 1930s and 40s, there weren't many in the South. Was that because the South was still fairly poor? Southern broadcasters never stepped up and asked for 50,000 watts around the clock?
Atlanta, then and now, is the biggest city in the Old South. It got WSB. But hardly anything else. Atlanta has only two AM station broadcasting at or above 5,000 watts at night, WCNN, 50 kw day/10 kw night, but not on the air at night until the 1980s, and WSB. That's it. Maybe 590 was 5,000 watts around the clock at one time, but it now it's WDWD, 12 kw day/4.5 kw night. All the other Atlanta AMs are either 1,000 watts, or 500 watts or running flashlight power at night.
How about other Southern cities? In Alabama, 1070 WAPI Birmingham is 50,000 watts by day, but only 10,000 watts at night, protecting KNX and CBA. Nothing in Mobile.
Tennessee did get two stations in Nashville, Class I-A 640 WSM and Class I-B WLAC 1510. But not much else. Memphis has a 640 at 50,000 by day but only 5,000 watts at night, to protect KFI. And it also has a 1070, KDIA, a legendary R&B outlet. But again, it has to protect KNX, CBA and I guess WAPI, so it drops to 5,000 watts at night.
No 50,000 watt stations in Columbia, Charleston or Greenville SC. None in Mississippi either.
North Carolina has WBT Charlotte. Raleigh has a 680 at 50,000 watts around the clock. But 680 is such a crowded frequency in the east that none of the 680s get heard much outside their local areas.
Meanwhile the FCC gave NYC 660, 710, 770, 880, 1130 and 1560 as Class A stations, as well as Upstate NY getting 810, 1170 and 1520. That's more than entire Old South put together.