@Opus 17 wrote:
As a shortcut, therefore we can say that a child living outside the US, Mexico or Canada can't be claimed as a dependent unless they have an SSN (because all children who could be claimed are eligible for SSNs).
No. Residents and Citizens of Mexico and Canada that are not in the United States usually do NOT qualify for a Social Security Number. They would have an ITIN, and can be claimed as a dependent with that ITIN.
