For a regular letter? Just one.
Only one.
Postage stamps typically go in the upper right-hand corner of an envelope. This is the standard placement for stamps on envelopes when sending mail.
It depends on what you are sending. You can calculate postage, see the related source link below.
Benjamin Franklin and George Washington were on the first US Postage stamps.
Yokiti Yamamoto has written: 'Japanese postage stamps' -- subject(s): Postage stamps 'Japanese postage stamps (for philatelists)' -- subject(s): Postage-stamps
As long as it meets the postage due, it can be done with a single stamp.
The number of stamps required to mail a letter from the US to the Philippines depends on the weight of the letter. For a standard 1oz letter, it typically requires around $1.15 in postage, which is equivalent to one Global Forever stamp as of 2021. It is recommended to verify current postage rates with the USPS before sending mail internationally.
Yes. Postage stamps never expire. You just have to use enough to equal the rate for the item you are sending. The exception to this is Forever Stamps. They always maintain the current rate.
No. The International Postal Union regulates the exchange of mail. The postage is collected and affixed at the post office of origin and no stamps of any other country are required.
With the second stamp issued by the US in 1847.
Ask at a post office in USA !
Yes, every country uses postage stamps.