Inflation adjusted first class postage rate, 1885-present. https://en.wikipedia.org/wiki/History_of_United_States_postage_rates?wprov=sfla1 https://en.wikipedi

Inflation adjusted first class postage rate, 1885-present. https://en.wikipedia.org/wiki/History_of_United_States_postage_rates?wprov=sfla1 https://en.wikipedia.org/wiki/History_of_United_States_posta...