#OnThisDay, April 30, 1939 - 152 anniversary of the oath given by the first US President George Washington - the New York World's Fair officially opened.

#OnThisDay, April 30, 1939 - 150 anniversary of the oath given by the first US President George Washington - the New York World's Fair officially opened. US President Franklin D. Roosevelt and Albert Einstein presided the ceremonies. The Polish Pavilion, which opened on May 3rd – on the 148th anniversary