Between 2006 and 2017 the first class letter rate has gone up eight times and down once. [1] [1] https://en.wikipedia.org/wiki/History_of_United_States_postage

Between 2006 and 2017 the first class letter rate has gone up eight times and down once. [1] [1] https://en.wikipedia.org/wiki/History_of_United_States_postage_rates https://en.wikipedia.org/wiki/History_of_United_States_posta...