Las Nevadas was originally supposed to be a sister nation of El Rapids
In the second Las Nevadas lore stream, when c!Quackity is telling c!George about Kinoko, I noticed something that I’ve never really heard people talk about before.
c!Quackity says, verbatim: “I thought we still had El Rapids going. I even- I made a whole plan with the Las Nevadas thing, and we were gonna have our own casinos and stuff and... George you guys made a country without me?”
I think this is an especially important bit of lore that a lot of people didn't realize/overlook. It explains the main difference between Las Nevadas and Kinoko Kingdom, for the people who think they left each other equally. Or that c!Quackity is a hypocrite for being so upset about Kinoko Kingdom when he “basically did the same thing”.
Las Nevadas wasn't a replacement for El Rapids, it was basically like a new country within the nation of El Rapids; it was an expansion, a surprise for them. Something nicer and grander, somewhere for them to get married and have their honeymoon. Literally everything there was something you’d need to do like a full wedding. The strip club and casino for the bachelor parties, the wedding venue for the ceremony, the karaoke stage and restaurant for the reception, the eiffel tower and hotel for the honeymoon. (Obviously, Las Nevadas was also for other things, but for this specific context, I’ll leave it there.)
Kinoko was a replacement for El Rapids. The rest of them abandoned El Rapids to make something new. It was the equivalent of all of your closest friends making a second group chat with all of them that only excluded you.