JMO, but I'm not sure we do in international play. The difference, IMO, is that the USA plays with that mentality even when they're not nearly as talented.
There is a confidence that borders on arrogance, associated with representing USA in international competition... An admirable spirit about being the best in the world. Not because of the craft, but because you're American and it's your birth right... Of course that spirit isn't always enough, but in evenly contested matchups it can be the difference!