Prior to 1848, a postal war between the US and Britain had resulted in prohibitively high charges for transatlantic mail—with the American post office levying a surcharge of up to 8 cents for incoming mail. An agreement was eventually reached under the Postal Convention of 1848 which governed postal relations with the United States for nearly twenty years. A single rate of 1s 0d. now prepaid a letter to its final destination with no extra charge expected from the recipient. Exact date unknown; if you have information about the correct date, please email [email protected] with this information.

Articles

Susan Donovan, “How the Post Office and Postal Products Shaped Mid-Nineteenth-Century Letter-Writing”