Lyndon Johnson actually said...
Now, Therefore, I, Lyndon B. Johnson, President of the United States of America, in recognition of the value of the New York World's Fair as an effective instrument for the promotion of international understanding, good will, tourism and trade, do hereby extend the welcome of the people of the United States to those persons who come to our country to visit the New York World's Fair, and express the hope that they will take this opportunity to enjoy the hospitality of other parts of our Nation.
04/29/1964