> Why should US citizens deeply care about Canada?
You don't have to deeply care about Canada to oppose annexation threats.
> Don't tell me Canadians lose sleep thinking about the well being of US.
A Canadian prime minister said Living next to you is in some ways like sleeping with an elephant. No matter how friendly and even-tempered is the beast, if I can call it that, one is affected by every twitch and grunt.[1]
You don't have to deeply care about Canada to oppose annexation threats.
> Don't tell me Canadians lose sleep thinking about the well being of US.
A Canadian prime minister said Living next to you is in some ways like sleeping with an elephant. No matter how friendly and even-tempered is the beast, if I can call it that, one is affected by every twitch and grunt.[1]
[1] https://en.wikiquote.org/wiki/Pierre_Trudeau#1969