create a shipping rule as:
Triggers:
Session Variable exists "eCartCheckoutForm_shipping_country"
AND
Based on session variable Value:
If the Session variable "eCartCheckoutForm_shipping_country" is "!=" a value of "US"
AND
Based on session variable Value:
If the Session variable "eCartCheckoutForm_shipping_country" is "!=" a value of "CA"
Calculation:
Flat Rate Shipping of "20"