On Nov. 6, the day after a national election that sent Donald Trump back to the White House, Elijah Graham and Owen King, who attend high schools on opposite sides of the Willamette River, were each greeted by the same Turkish proverb posted on their classroom bulletin boards: “When a clown moves into a palace, the clown does not become a king—the palace becomes a circus.” A similar mood met students across Portland that Wednesday morning. “The air was pretty intense,” says Camila Sahagun, a sophomore at Lincoln High School. Connor Jacobsen, a senior at Benson Polytechnic High School,...