In other words, this site is pretty safe...
This is for our Canadians or Europeans friends that wish to access the U.S. content/promotions of iTunes.
The iTunes country verification is actually done through the credit card.
If you don't need to buy items on iTunes the easiest way is to follow Apple.com instructions on how to sign up for iTunes without a credit card. Just make sure to select U.S. as your country when you are presented with the flags.
Now if you want to be able to buy items from the iTunes store, the best way is to get a U.S. gift card. I have read the Canadian uses the master card gift cards purchased in the U.S. but I didn't try myself.
Hope it helps.