almost 100 years in the U.S. almost 100 years in the U.S. about.usps.com about.usps.com Rates for Domestic Letters Since 1863 about.usps.com about.usps.com rates cost per ounce of postage in 1885: 2 cents USPS rates almost 100 years in the U.S. about.usps.com cost per ounce of postage in 1885: 2 cents about.usps.com about.usps.com about.usps.com about.usps.com about.usps.com about.usps.com almost 100 years in the U.S. Rates for Domestic Letters Since 1863 about.usps.com