08/31/1966
https://www.presidency.ucsb.edu...
"Long live the friendship of Mexico and the United States."
"Reason, understanding, and good will have achieved a settlement of which both our peoples can be proud."
"May these links between our two countries, like the Chamizal itself, stand as testimony to the world of how good neighbors conduct their affairs."
"At 12:01 this morning, the boundary between Mexico and the United States changed at El Paso and Ciudad Juarez."