Its the same over here in England. By far the majority are right handed/shoot right, whereas I (having been brought up in a hockey family and in a hockey savvy part of the US) was always taught to play right handed/shoot left.
One of our coaches, who is Canadian, believes that so many Brits playing the 'wrong' way around may in part account for so few Brits being successful outside of this little backwater when compared to much smaller, but more hockey savvy, mainland European countries.
One wonders how much potential has been wasted due to kit buying parent's lack of knowledge, hockey stores who just want a sale (no questions asked) and poor quality coaches at the entry level who don't pick such simple mistakes up?