Minor point, but I very carefully avoided using "on foreign soil," as technically it is US soil, just as Embassies may physically be surrounded by foreign soil, but are technically sovereign land of country that owns the Embassy. A good example / demonstration of this is Julian Assange on Ecuadorian land but surrounded by London.

Don't know exactly where the boundary is, but after going through passport control at YVR the agent would sometime say "Welcome to America," as I was at that point on US soil. It's the flying through Canadian airspace before entering US airspace that has me confused