When we first went, one by one, into the room with the interrogating officer they used that line about "America is at war, and Canada may not take that seriously..." and "since 9-11, we take these things seriously."

U.S. border idiots ban Canadian rock ban from entering the U.S. for 5 years because they lied about whether they were playing a live show.

I take it very seriously that U.S. border agents would evoke war in the context of visa requirements that exist for the purpose of economic protectionism and not national security.

EconoCulture - Homeland Security: Why the Grey is Banned in the US