In the sticky-hot, soundproofed little White House broadcasting room, Harry Truman smiled a quick, reassuring smile toward Bess and Margaret. Then the President of the U.S. stepped up to the solitary rostrum in the glare of the floodlights, flipped open his loose-leaf notebook, and swam into the radio and television focus of the world.
"My fellow citizens," he began, "tonight I want to talk to you about Korea, about why we are there and what our objectives are."
He was wearing a blue necktie patterned with tiny oak-wreathed globes: the design of the U.N. flag. For 22 minutes he talked in...