@AlexanderVI I think you might need to read through it again. In this case, the US has expressed its intention to attack and is moving troops into position within reach of the border.
Letting those troops to get into position and cross our border before taking any action would be insane. Especially with 2/3 of the population only an hour from the border.
And don't worry about real estate! It will be much less valuable when it's been pounded into rubble by American bombers and missiles.