Canadian & Australian actors

Has anyone noticed that so many of the new, talented "American" actors are actually Canadian or Australian? Is this another sign of U.S. decline? Or is it a tribute to the talent coming out of those fine, friendly nations?

We've had the British Invasion for some time, in theater and music... I suppose this is a variation on that theme?

Canada: Jim Carrey, Kiefer Sutherland, Brendan Frasier, Mike Myers, Michael J. Fox (I'll add to this list as I recall 'em)

Australia: Nicole Kidman, Russell Crowe, Naomi Watts, Heath Ledger, Cate Blanchett (I'll add to this list as I recall 'em)