Why should the school boards (or whatever organization) take the chance in a climate where the Trump administration is trying to bar entry to certain Nationalities?  Picture yourself as a teacher on a busload of kids & one uninformed border guard on a power trip. Plenty to see & do in Canada.  Spend the money here.  I changed a ski trip from a US destination to a Canadian one-BC was terrific. The US can either be welcoming to tourist dollars, or they can lose out.