President Obama will become the first sitting U.S. president to visit Hiroshima, the Japanese city that the United States nearly destroyed with a nuclear bomb in 1945. While the bombing ... killed as many as 150,000 people, Obama is not expected to apologize during his visit. After more than 70 years, why not apologize for Hiroshima? Countries in general do not apologize for violence against other countries. What else has America not apologized for? Here are a few ideas. During the Vietnam War, the United States sprayed about 12 million gallons of Agent Orange, a herbicide, over areas of Vietnam, Cambodia and Laos. About 1 million people were disabled or suffered health problems because of contact with the herbicide. There has been no apology for this or for other controversies of the war. In 1953, democratically elected Iranian Prime Minister Mohammed Mossadegh was overthrown in a coup [that] was carried out under CIA direction ... with the aid of the British Secret Intelligence Service. The United States and Britain have never apologized for [this], with the Obama administration recently stating that it had no plans to. The United States is also widely suspected of involvement in a bloody 1973 coup that ousted socialist Chilean President Salvador Allende in 1973 and put dictator Augusto Pinochet in control. In 1977, Brady Tyson, deputy leader of the U.S. delegation to the U.N. Human Rights Commission in Geneva, did ... offer an apology for the U.S. involvement in the coup, but he was quickly disavowed by the State Department.