I'm pretty sure half the red states already block it.
Instead I'd suggest a more technically involved approach of blocking the middle fifth (a 25% tariff) of the screen of videos with a large black bar that has a Canadian flag and a beaver (not that kind) on it.
If you want to send a message it's better to avoid a full blackout since most regular folks will just assume it's a server outage. Make it clear it's intentional.