it has been a rethorical one trying do point out the case of US-defaultism

No, I understood that. My reply was meant to be read as a rebuke to that idea. Because it isn't an American day. It's less observed in America than it is in many other countries. Claiming it to be US-defaultism relied on a mistaken assumption that because some Americans are talking about it, it must be a uniquely American thing.

Ironically, your complaint about "US-defaultism" was itself the US-defaultism.