I've been considering different butterflies that may occur in a CSA victory TL I'm working on, including the effects it may have with the OTL purchase of Alaska by the USA. In order to help me choose a good idea please tell me which TL idea do you prefer.
1. The USA purchases Alaska and successfully annexes British Columbia.
2. Russia fails to sell Alaska, discovers its mineral wealth, and improves its infrastructure with the resources.
3. Option two + Britain and Russia go to war ending up with Alaska being added to Canada as a territory and increases its power.
4. Other - explain