I think my favorite part of this is looking at the Canadian and British plans for if the US invaded Canada.

Canada's plan was to pre-emptively invade the US, knowing that Canada wouldn't be able to hold the territory long-term. They would go as deep as they could before they started to fall back as slowly as possible, hoping to buy time for the UK to sail over and invade the mainland US.

The UK's plan was to abandon Canada and just let the Americans take over. Losing Canada was seen as "non-fatal" to the UK, and it was believed that sending an invasion force to fight back would hurt the UK more than if they just abandoned Canada's defense entirely.