Stamps are used to mail letters, if people still do that. US stamps are purchasable at one's local post office. Barnes and Nobles also sell US stamps.
Yes
3 stamps.
US postal stamps can only be used for letters that are mailed in the US. If you are mailing a letter in a European country, let us say France, they you need to use French postage to mail a letter to the US or any other destination.
No - Us stamps can only used on mail sent from the US.
4
That is what stamps are for, to pay postage. In the US you buy postage stamps and put them on mail to any other country in the world.
You can use forever stamps on a letter to Australia. It is worth 44 cents toward the cost. You must put additional postage on the envelope.
Yes, the US will allow any postage stamps to be used at their face value. Used stamps cannot be re-used, that would be illegal.
The rate is $2.10 ( Australian) from up to 50 grams via air mail from Australia to the US.
According to the United States Postal Service's website, "Stamps for standard-sized letters and standard-sized postcards up to 1 oz start at $1.15 for all countries."
No you cannot use them. Forever stamps can only be used for domestic (inside the US) mail. They must have a value on them for international mail.