Julian E. Zelizer is a columnist at Foreign Policy and a professor of history and public affairs at Princeton University. He is the author of The Long View, a newsletter putting the news in perspective.
Richard Nixon stands in the door of the presidential helicopter with both arms raised and a smile on his face as he gives the victory sign. A crowd of uniformed military service members and Secret Service officers stand at attention outside the chopper.
U.S. President Joe Biden speaks during a meeting with Israeli Prime Minister Benjamin Netanyahu in the Oval Office at the White House in Washington on July 25.
Republican presidential candidate and former U.S. President Donald Trump pumps his fist as he is rushed offstage during a rally in Butler, Pennsylvania, blood on his face.
Lyndon B. Johnson is surrounded by soldiers in this black-and-white photo as he visits U.S. troops in Vietnam. Johnson smiles as he shakes hands with a service member wearing uniform. He is flanked by security officers in dark suits.
