President Barack Obama is making history this morning, speaking in the city of Hiroshima, Japan.
Mr. Obama is the first sitting U.S. President to visit the site, where in 1945, the U.S. dropped an atomic bomb, killing more than 140,000 people.
The President put a wreath at the memorial, and in his remarks, said the memory of the morning the bomb was dropped must never fade.
He also said the world has a shared responsibility to prevent suffering like that, which took place in Hiroshima over 70 years ago.
During his speech, President Obama did not apologize for President Truman's decision in 1945 to drop an atomic bomb on the city.