I believe its only for the US.
I have a colleague who has a place in Belize that he has to travel to through the US.
For that alone it was worth the cost / inconvenience to him.
He said that after applying he had to travel to a land border crossing for an interview.
I looked at one when I was doing a bunch of work in the US a year or so ago.
I may again if KXL gets approved and I'm back on the job.
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