10/23/1949
https://www.presidency.ucsb.edu...
"Now, Therefore, I, Harry S. Truman,President of the United States of America, under and by virtue of the authority vested in me by section 2 of the act of June 8, 1906, 34 Stat. 225 (16 U.S.C. 431), d..."
"Now, Therefore, I, Harry S. Truman, President of the United States of America, do hereby proclaim Wednesday, April 14, 1948, as Pan American Day"
"I, Harry S. Truman,President of the United States of America, do hereby proclaim Wednesday, April 14, 1948, as Pan American Day"
"I designate the week beginning April 11, 1948, as Pan American Week"