December 15, 1966. LBJ views a model of the U.S. Pavilion for Expo ’67, the World’s Fair to be held in Canada. The pavilion is a geodesic dome designed by Buckminster Fuller.
In conversation around model with geodesic dome are: Leonard Marks (2nd from left), President Lyndon B. Johnson, R. Buckminster Fuller (2nd from right). Others: Amb. Edgar Ritchie (Canada), Pierre Dupuy (Canada), Milton Friedman. The photo was taken in the Cabinet Room of the White House. LBJ Presidential Library photo A3492-7, public domain.
FDR Opens the World Fair on Long Island, New York
On April 30, 1939, Franklin D. Roosevelt became the first president to appear on television by addressing the opening ceremonies of New York World’s Fair.
Listen to his remarks - from The Presidential Timeline