While Canada collects interest semiannually, the American interest tends to be accrued monthly. Their rates can be extremely low when opting for the term to be fixed for 15-30 years. The Adjustable Rate Mortgages (ARM) are more so available for those opting for shorter terms spanning from 3-7 years with amortization periods leading up to 30 years. The rates would be locked for the first term and would adjust from there on.
In America, the mortgage offers tend to have longer fixed term options with extremely low rates. They also have the option for shorter terms with an adjustable rate mortgage to adapt and change as the market adapts and changes. Most of the mortgages also offer for the borrower to be able to pay off the mortgage at any time with no penalty.