History, memory & Hiroshima: Why President Obama's visit matters

President Barack Obama's visit to Hiroshima in Japan will be the first ever by a sitting US president, remembering the hundreds of thousands of lives lost and scarred when the United States became the first and (thus far) only power to use nuclear weapons, dropping two in August 1945 to force Japan's surrender, ending World War II. Critics complain that Obama's visit makes the US look weak. Supporters call the visit inspired, a sign of respect for a close ally, recognition of pain and loss, a realization that how and what societies remember, shapes their future. They say facing history is not only a sign of strength, but of moral leadership.