Question about apple.ca

I am currently in Canada on vacation. I want to purchase my brother an Iphone but instead of buying it in the US and then having my wife ship it to us here. I want to buy it on the apple.ca website but can I use my American credit card on the site.

yes

should be fine to use US credit card in canada

may take a hit on exchange rate

Using a Canadian CC on the US site might cause problems, but other way around -- no problems!