Postage Stamps

What is the price of first-class U.S. postage stamps, and how often has it changed?

1863: 3 cents (effective Mar 3)
1883: 2 cents (effective Mar 4)
1917: 3 cents (effective Nov 3)
1919: 2 cents (effective Jul 1; dropped back by Congress)
1932: 3 cents (effective Jul 6)
1958: 4 cents (effective Aug 1)

Source: 

U.S. Postal Service

Notes: 

See also Wikipedia's chart of postal rate changes, or the USPS Postal Explorer site for current rates.

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