Signing the Armistice ending three-year conflict in Korea, on July 30, 1953. Lt. Gen William K. Harrison, Jr (seated left), Chief UN Delegate and Gen Nam Il, (Seated right), Senior Communist Delegate, sign at Panmunjom. PhotoQuest/Getty Images

In the long history of Korea, nothing compares to the 20th century division of the peninsula or the war that followed. That war has not finished, and a peace treaty remains elusive. China, North Korea and South Korea all seek a peace treaty, but 11 U.S. presidents since 1953 have been unwilling to agree.

If President Trump turns out to be the exception, that shift could help put an end to more than a half-century of conflict — and the role of the United States in determining whether peace arrives is not a small one. Neither is it coincidental: in fact, the U.S. has played a key role in keeping the conflict going as long as it has.

The division of Korea is not what Franklin Delano Roosevelt intended as World War II ended. Read Morenorth,south