An Internet country code, or country code top-level domain (ccTLD), is two letters. For example, the United States is .us, France is .fr, and Japan is .jp.
You use the stamps from the country of origin. So if you are mailing a letter from the US to Australia, you use US postage.
The country with the letters "newsed" is Sweden.
Yes. Letters can be mailed from the US to Nova Scotia, and vice-versa. As these are letters outside the country of origin, the postage costs a bit more than domestic mail.
Czech Republic is a country. It has 13 letters.
The US
The country with the most letters in its name is the United Kingdom.
Norway is the country that contains the letters yanrwo.
No country has all of those letters in a single name.
No country in Europe begins with the letters "To-". Togo is the only country that begins with the letters To. Togo is in Africa.
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.
The letters "occisaatr" can be rearranged to spell the country "Costa Rica."