Expositions
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.
Golden Gate International Exposition
On February 18, 1939, the Golden Gate International Exposition opened in San Francisco, California.
Panama-Pacific Exposition
On February 20, 1915, the Panama-Pacific Exposition opened in San Francisco, California.