Opening Day at 1939 New York World's Fair

The transcript describes a ceremonial event at the World's Fair, highlighting the presence of notable figures such as Grover Whalen, president of the World's Fair Corporation. The event includes a dedication address and features military detachments from the Army, Navy, and Marines, all gathered at the Court of Peace.

What is the significance of Grover Whalen in the context of the ceremony?

Who were the builders of the gigantic display mentioned in the text?