Wildlife Conservation Series
On May 5, 1956, the US Post Office issued the first stamp in a 22-year series calling attention to the importance of wildlife conservation.
Stamp Series
American Scientists Series
On May 4, 2005, the USPS issued the first set of stamps in the American Scientists Series.
American Folk Art Series
On April 13, 1977, the USPS issued the first stamps in the American Folk Art Series. The Folk Art Series honored important and lesser-known items in American art and culture.
USPS Introduces Nature of America Series
On April 6, 1999, the USPS issued the first stamp sheet in its 12-year Nature of America series. This popular series featured the first US self-adhesive sheets designed as one large scene.
American Revolution Sesquicentennial
On April 4, 1925, the US Post Office issued the first three stamps in a multi-year series honoring important events and people from the American Revolution. The stamps were issued for the sesquicentennial (150th) anniversary of the Revolution.
Start of the Literary Arts Series
On February 27, 1979, the USPS issued the first stamp in the Literary Arts Series honoring author John Steinbeck. The series has continued for 45 years, honoring 35 writers from a variety of backgrounds.
Sanitary Fair Stamps
On February 22, 1864, some of the first Sanitary Fair stamps were issued. These stamps raised millions of dollars in funds and supplies for the Civil War.
USS Maine Explodes – Ignites War
On February 15, 1898, the USS Maine mysteriously exploded in Havana Harbor, leading the US to declare war on Spain two months later. Special Revenue stamps depicting the Maine were produced to fund the Spanish-American War and the event had a significant impact on US postage stamps.
Global Forever Series
On January 28, 2013, the USPS issued the first stamp in its Global Forever Series. These stamps were created to simplify sending international mail.