Florida here. I don't say Coke for all soda just for a dark cola. But Coke is just the first brand I think of/want when it comes to Soda. Like the most ubiquitous.
If I want a Root Beer I'm gonna ask for that. But I'd never fucking say Pop.
Florida here, I say Coke for standard cola style soda and will use it to reference soda in a general manner if discussing with someone obviously from the South. I use soda as well.
My wife grew up with pop and Pepsi as her regional standards. I make sure to reinforce soda and Coke as the correct standards since I'm not insane. ;)
Yes, because there's no real difference between Kleenex and other brands of tissues. There's a huge difference between a coke and a sprite for instance.
In reasonably confident that this is how people ask for a cola, not for any soda pop. The default soda in America is a cola, which we have the two primary brands (coke and Pepsi) and all the small time competitors. No one says ‘I’ll have a coke’ when they want a sprite.