Because fire doesn’t give a fuck about your imaginary lines in the dirt…
So I’m not disagreeing with you about fire not caring about borders. It is worth noting, though, that the border between the US and Canada is not just imaginary. It does have an actual physical demarcation. And that demarcation actually can slow the spread of fire across the border, if only slightly. The trees at the border have been cleared for a 20 foot wide gap, often referred to as “The slash”.
So I’m not disagreeing with you about fire not caring about borders. It is worth noting, though, that the border between the US and Canada is not just imaginary. It does have an actual physical demarcation. And that demarcation actually can slow the spread of fire across the border, if only slightly. The trees at the border have been cleared for a 20 foot wide gap, often referred to as “The slash”.
https://en.m.wikipedia.org/wiki/Canada–United_States_international_border_vista
While that is true. As someone who literally lived on the border for my formative years, this is not clear-cut across the country.
In my case, it is a concrete marker in the middle of the forest.