how a letter goes to a foreign country

     When you mail a letter, the stamp you put on it has been  purchased from the United States government. The United States Postal Service will take your letter anywhere in the United States, for the same price. If you want to send a letter to another country, the stamp costs more, but the money still goes to the United States Post Office. When our post office puts your letter on a plane, and it lands in a  foreign country, the post office of the foreign country takes your letter to its destination, at no additional charge to you. The person to whom you sent the letter doesn't have to pick it up at the airport. It is usually delivered to the address on the envelope. Our post office does the same thing when letters are sent from a foreign country to someone in the United States. A small but important example of international co-operation.