HIROSHIMA, Japan — An emotional John Kerry said Hiroshima’s horrible history should teach humanity to avoid conflict and strive to eradicate nuclear weapons as he became the first U.S. secretary of state to tread upon the ground of the world’s first atomic bombing.

Kerry’s visit today to the Japanese city included him touring its peace museum with other foreign ministers of the Group of Seven industrialized nations and laying a wreath at the adjoining park’s stone-arched monument, with the exposed steel beams of Hiroshima’s iconic A-Bomb Dome in the distance.

The U.S. attack on Hiroshima in the final days of World War II killed 140,000 people and scarred a generation of Japanese, while thrusting the world into the dangerous Atomic Age. But Kerry hoped his trip would underscore how Washington and Tokyo have forged a deep alliance over the last 71 years and how everyone must ensure that nuclear arms are never used again.

“While we will revisit the past and honor those who perished, this trip is not about the past,” he told Japanese Foreign Minister Fumio Kishida, a Hiroshima native. “It’s about the present and the future particularly, and the strength of the relationship that we have built, the friendship that we share, the strength of our alliance and the strong reminder of the imperative we all have to work for peace for peoples everywhere.”

Kerry’s appearance, just footsteps away from Ground Zero, completed an evolution for the United States, whose leaders avoided the city for many years because of political sensitivities.

No serving U.S. president has visited the site, and it took 65 years for a U.S. ambassador to attend Hiroshima’s annual memorial service. Many Americans believe the dropping of atomic bombs here on Aug. 6, 1945, and on the Japanese city of Nagasaki three days later were justified and hastened the end of the war.

Kerry didn’t speak publicly at the ceremony, though he could be seen with his arm around Kishida and whispering in his ear.

The otherwise somber occasion was lifted by the presence of about 800 Japanese schoolchildren waving flags of the G7 nations, including that of the United States. They cheered as the ministers departed with origami cranes in their national colors around their necks. Kerry was draped in red, white and blue.

Hours afterward, the top American diplomat still seemed to be absorbing all that he saw.

“It is a stunning display, it is a gut-wrenching display,” he told reporters of the museum tour, recounting exhibits that showed the bomb, the explosion, the “incredible inferno” and mushroom cloud that enveloped Hiroshima on August 6, 1945.

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