This is just a fun thought exercise. Let’s say we have perfect records going back as many generations as we needed to make the hypothetical scenario legally work. What citizenships could they theoretically hold at the moment of their birth? Assume all processing could also go through immediately and without an issue.

Off the top of my head, let’s say a child is born in Mexico on vacation to a Father who is US citizen, Mother who is Pakistani but who immigrated to Canada. Paternal grandfather was Jewish and Polish, paternal grandmother is Italian.

The child could have 7 birthright citizenships in my scenario: Mexico, Canada, US, Pakistan, Israel, Poland, Italy.