USPS stands for United States Postal Service. USPS First Class Mail is a mail service used to send things in envelopes and packages that weigh up to 13 ounces. The delivery time frame for USPS First Class Mail normally ranges from 2 to 3 business days.
First Class Mail is delivered jn three to five days.
Assuming you mean the US and not the continent of America then it is the US Mail USPS
First class mail is the designation for sealed letters that do not qualify for special bulk rates.
I'm assuming you mean from America to the UK so it would be $0.98
Depends on how it is sent. I'm assuming you mean by first class which is 2-3 days average for anywhere in the country. Can be sent Express mail for next or 2 day delivery by 12 or 3pm (Pay extra for noon delivery). Express mail is trackable online and is guaranteed to be there by the day and time you pay for or you can get a refund.
If you use enough of them! The current rate is 44 cents in the US. That would mean at least 15 3 cent stamps.
It means the mail was processed and left the United States; the mail is on its way to the APO address and is usually delivered in a matter of 4-7 days.
1st Class Large Letter
I don't know what you mean by "set up mail delivery". You don't "set it up", you just have people use the general delivery address when they send you things.
It depends on what the mean of the class was in the first place!
It means a package has left its point of origin.
Via mail means that something was sent using the US Postal Service. Via Mail means by using any of the services that the USPS uses.