The South

[True Federalist (진정한 연방 주의자)]

Yes,

The Hispanic share of the population is increasing rapidly in Texas and I think the black shares of MS & SC are increasing as well (albeit at a smaller rate). It will be a while before this change is enough to affect MS & SC, but Texas should be in play within a generation or so.

Actually, the Black share has been going down in SC, but so is the non-Hispanic White share.  While there is no longer the heavy Black outmigration that there was c. 1900-1970, recent inmigration has been a combination of people moving here from elsewhere in the States at roughly the same proportion as national demographics and Hispanics moving here for physical labor jobs.

[True Federalist (진정한 연방 주의자)]

Like much of the South Carolina coast, Horry is more a Libertarian/Small Government type GOP rather than Religious Right GOP, as is the upstate.  For instance, back in 2006, on Amendment 1, which banned same-sex marriage, Horry voted 73.7% Yes while statewide it was 78.0% Yes.  Horry was the fourth-best county for the Noes, beaten only by Charleston, Richland, and Beaufort.  Richland has the capital while Charleston and Beaufort are two more coastal counties.  (Even in Charleston, the Yeses got 64.8%.)

So for example, while Todd Akin would have no problem winning the upstate Religious Right districts (The strongest Yes vote was in Cherokee at 90.3%.), I think he could have lost if he'd been running in the 1st or 7th.

[True Federalist (진정한 연방 주의자)]

If it wasn't for the Solid South, the Democratic Party would have ceased to exist a long time ago, and the GOP would be completely dead today.

Fixed for history

Not really. The Democrats being tarred as the party of rebellion could very well have killed it off.  If the Radical Republicans hadn't taken charge of the party, it's entirely possible we'd have entered a Second Era of Good Feelings with only one major party after the Civil War.  It likely wouldn't have lasted long, tho I wouldn't rule out the possibility that a post-Civil War Unionist Party might have become an American version of the Mexican PRI or the Japanese LDP.