To move the Oregon/Idaho border, we need to convince 3 groups. Each group gets its own campaign: rural Oregonians, Idahoans, and Oregon state legislators.
Phase 1: Oregon/Idaho
Step 1: Rural Oregonians collect signatures to get greater idaho on their county ballot, or convince county commissioners to put a question on the ballot.
Step 2: rural Oregon counties vote (non-binding)
Step 3: Government of Idaho holds hearings and invites Oregon’s government to do the same. Both governments analyze the possibility.
Step 4: Citizens convince the state legislatures to make a compact with the other state and pass it
Step 5: hopefully the compact includes a plebiscite for rural Oregon to approve or disapprove the final compact.
Step 6: Congress approves
Before we can add California counties to Idaho, we need to complete phase 1: moving the Oregon/Idaho border.
The Washington State counties that Idaho would accept (Columbia, Garfield, and Asotin) don’t have many people, so it will be hard to get the Washington State Legislature’s attention until we have success in Oregon.