Here is a rundown of the historical cost of mailing a first-class letter in the United States. In the first half of the 19th century the cost of sending a single sheet of paper 40 miles or less was between 6 cents and 8 cents, with the cost rising by distance. Letters going 400 miles and over cost 25 cents to send per sheet of paper. By the middle of that century postage stamps were introduced, along with standard rates regardless of distance traveled. These started at 2 cents per half-ounce in 1863, rising to 3 cents in 1883. In 1885 the current first-class standard based on 1 ounce was started. The 1 ounce rates since then have been: July 1, 1885: 2 cents. Nov. 3, 1917: 3 cents. July 1, 1919: 2 cents. July 6, 1932: 3 cents. Aug. 1, 1958: 4 cents. Jan. 7, 1963: 5 cents. Jan. 7, 1968: 6 cents. May 16, 1971: 8 cents. March 2, 1974: 10 cents. Dec. 31, 1975: 13 cents. May 29, 1978: 15 cents. March 22, 1981: 18 cents. Nov. 1, 1981: 20 cents. Feb. 17, 1985: 22 cents.