Yes, that is what stamps are for, to pay postage from the US to anyplace else in the world, regardless of the country. A standard letter would cost 72 cents.
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.
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.
To mail a single letter to Canada, the stamp must be equivalent to the postage cost. As long as the stamp is equal to the postage, any letter can be sent with any kind of postage stamp.
Have to use postage from country of origin
No, the postage used needs to be from the country of origin, in this case, Canada.
no, because for each letter, you can only use 1 stamp. Yes, you certainly can in Canada, and most other countries. Postage paid is postage paid, regardless of the stamp denomination. Assuming, of course, that the stamp total is sufficient to cover the required postage.
it can weigh up to one ounce using one stamp
You must use Canadian postage stamps when you are mailing a letter from Vancouver, BC, Canada. You would need to purchase a certain stamp depending on the letter's destination. Postage rates apply to domestic, USA, and International destinations.
Canadian stamps are only used in Canada. When mailing a letter, you use the stamps of the country of origin. So only Canadian stamps can be used there.
The value of the Forever Stamp is the domestic First-Class Mail letter price in effect on the day of use.
No, you can't. You should go to your local U.S. post office and purchase a Canadian stamp to mail your letter.
Depending on the country your in, if in England use a second class stamp or a santa stamp from the postoffice.