Ummm, if you mapquest the address where it crashed
The drone crashed Tuesday on Craddock Avenue, near the intersection with Yarbrough Drive.
You'll see that it's maybe a good three wood from the border.
So chances are it was probably on their side when whatever it was happened that caused it to turn into an oversized paper airplane and glide onto our size of the fence. Considering that these generally operate at a couple of thousand feet, crashing about 4 blocks in US territory looks more like a whoopsie, then ZOMG!! Pancho Villa is at it again !!!1111nineteenseventeeny.....
Sorry, take off the foil beanies and carefully stow them away until next time....