It's a long, tedious and somewhat complicated process that involves Paint.NET, overuse of the line tool, and a lot of free time. I'm thinking of doing a full tutorial at some point, but it's a bit too long to explain in a comment.
Nevada never existed ITTL. Washington is split in two because the eastern half is mostly Mormon (long story, read chapter XXIII of the TL (www.alternatehistory.com/discu… )), and Sinaloa was taken by the Army during the Mexican Revolution and subsequently "voted" to become part of the US. Railroad companies had more to do with the result of that vote than the people did, which should tell you something about this US.
Oh, I understand now. There was no need to isolate the Mormons in Utah from the mineral resources in Nevada and Colorado (Jefferson), because they settled in Clackamas instead. A very interesting scenario.
Actually, the Mormons still settled in Utah, but a large portion of them ended up moving to the Bitterroot Valley during TTL's Utah War (they very nearly did IOTL, but Indian uprisings prevented it). The ones that are left in Utah aren't numerous enough to outnumber the Gentiles in the territory, so Congress kept the area in one piece in the hopes that the Mormons would always be a minority there.