US versus Canadian savings account returns

[accountingsucks]

I now see that Emigrand Direct is paying 4.8% on a savings account in the US. Unfortunately as a Canadian we can not deposit at Emigrant. We do have ING available to us and the rate is around 3.4% last I checked while in the US I believe ING is paying 4.5%. I'm getting 3% with my bank here in Canada and am not going to switch to ING for the extra .5%.

Why the discrepancy in rates between US and Canada?