No, you use the postage of the country where you are mailing the item.
The stamp has to be accepted where you mail the letter. If you are mailing in Canada, you need a Canadian stamp. If you are in the US mailing to Canada, you can use a US stamp.
No. Belize is a country in Central America.
You can use US postage since origin US but since int'l will take more than 1 stamp
Yes, you can ... forever ...
No, you should only use US stamps for mail posted in the US.
Yes, this stamp can still be used for four cents of postage. It was issued in 1991.
You use the postage of the country of origin, in this case, you would use Canadian postage.
If you are posting it in the US, yes. As long as the amount on the stamp covers the overseas postal charge.
That is what you do with a stamp, put it on a letter to pay for it to be delivered. You always use the postage from the country you are mailing the item in.
Which one? There is one in Belize as well as the US.
One U.S. dollar is worth two Dollars in Belize
In the US a five cent stamp can be used toward making up the postage rate necessary.