If you look closely at US dollar money orders from Canadian Banks
most of the time they have a US bank account number from their
"partner" bank in the US.

For example, there could be a Bank of Montreal logo then in smaller
type the name and US address of an American bank.  This way the check
clears easily in the US.

>We receive money orders from Canada every month for payment of our
>Skreenz. They are from various Canadian banks and credit unions
>denominated in US Dollars. No problem.