Ummm, I have been riding in rural Arizona, USA and had trouble finding presta valves so I don't think it is necessarily a country thing. I wasn't touring, but was in the middle of a double century late on a Saturday and Walmart only carries schrader valves (and before you get on me for not having spares, I had over 13 flats that night and was able to cope due to a large supply of glue patches I carry no thanks to the Walmart).
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Sunrise saturday,
I was biking the backroads,
lost in the moment.