The present US/Mexico border was set by the treaty of Guadalupe-Hidalgo AFAIK, If any of Mexico’s southern border is an English speaker’s fault I’m unaware of it, I suppose Canada was still pretty much a British crown colony when most of the US/CA border was hashed out, but except for Demented Child Rapist In Chief nobody contests that border.
North America?
The present US/Mexico border was set by the treaty of Guadalupe-Hidalgo AFAIK, If any of Mexico’s southern border is an English speaker’s fault I’m unaware of it, I suppose Canada was still pretty much a British crown colony when most of the US/CA border was hashed out, but except for Demented Child Rapist In Chief nobody contests that border.