You do have a few listings that such as the Under Armour tee that show shipping to Canada only so you need to change those listings to include the United States.
The majority of your listings do have the option to ship to the US but there is no shipping price showing. In fact I only see one shipping cost to the US and that is for the military jacket where you used a flat rate of $21.99 to the US AND the same rate to every other international country.
I am going to guess that the main problem is that you are using the simple sell your item form which only allows you to show one international shipping cost so if you want to ship worldwide you need to change to the longer form. You might be able to do that by clicking on a link on the top right of the listing page.
Keep in mind that when you set up calculated shipping, you must use a shipping service that Canada Post uses for that country so you must choose a service with USA in it if you are shipping to the US....otherwise, the calculator won't work.
For international, you've chosen international surface which will take from 2-3 months and which is fairly expensive. Most buyers are going to file a claim before the package arrives when you use any surface mail. Small packet international air is less expensive and faster. It doesn't have tracking though.
There's tons to know about shipping but I have an appointment so have to go...i'm sure someone else can give you more info.
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