Who was the U.S. president when Philadelphia's 1926 Sesquicentennial Exposition opened?

Calvin Coolidge was the U.S. president when Philadelphia's 1926 Sesquicentennial Exposition opened.

The exposition celebrated the 150th anniversary of the Declaration of Independence and opened in Philadelphia in 1926. Coolidge, the 30th president, was in office from 1923 to 1929 and participated in the national commemoration associated with the fair.

The event followed Philadelphia's 1876 Centennial Exposition and preceded the nationwide Bicentennial celebrations of 1976. Its grounds were in South Philadelphia, and the exposition included industrial, artistic, scientific, and commercial displays.

Coolidge is sometimes confused with Herbert Hoover because Hoover was then secretary of commerce and spoke at the opening ceremonies. Hoover did not become president until 1929. That distinction makes the presidential answer specifically Calvin Coolidge.