I think that’s more or less NAFTA (or whatever the rebranding was), that’s essentially the same terms Canadians can enter the US under.
As well, between Canada and the US you’re covered under the visa waiver program, so you don’t even need to apply or anything. Just show up at the border.
It’s a fairly well known gotcha up here (at least among my circles). If you’re going to the US for meetings or conferences you are _only_ going for meetings and conferences. You will not be working at your hotel in the evening. You’ve set your auto responder and will not be responding to work emails.
Generally it’s fine, but sometimes you get the CBP guy that wants to ruin someone’s day or is a stickler for the rules and you’re told to apply for a full work visa and sent back home.
