Today in History: June 21, US Constitution becomes law

On June 21, 1788, the United States Constitution became law as New Hampshire ratified it. Other historical events include Cyrus Hall McCormick receiving a patent for a mechanical reaper in 1834 and the first Ferris wheel opening in 1893. Additional notable events span topics like the American Cancer Society's 1954 smoking study, the 1964 civil rights activists' deaths, and the 1989 Supreme Court flag-burning ruling.