On May 27, 2016 (April 21, 2016 in the lunar calendar), Obama, the first incumbent US President, visited Hiroshima, which was "bombed by a US nuclear bomb." On May 27, 2016 local time, U.S. President Barack Obama visited Hiroshima, Japan. This was the first time since the end of World War II that an incumbent U.S. president visited the nuclear explosion site of World War II, and therefore attracted much attention from the outside world. As he stated before, Obama only emphasized the "cruelty of war" and "a world without nuclear weapons" and did not apologize for nuclear explosions. Can this "political show" visit at the end of Obama's term promote non-nuclear weapons, strengthen the Japan-US alliance, and "add bricks and tiles" to the rebalancing of the Asia-Pacific region? Can Abe be allowed to downplay the crimes of Japan's "invaders" as he wishes and add points to the July election? We will wait and see. "I'm here": Only laying flowers but not apologizing Obama laying flowers On the afternoon of the 27th, US President Barack Obama visited Hiroshima, Japan, the site of the nuclear explosion in World War II, for the first time, and laid a wreath at the nuclear explosion memorial in Peace Memorial Park. Obama, whose term was coming to an end, finally set foot on Hiroshima, which was bombed by a US nuclear bomb, for the ideal of being free from nuclear weapons. In the more than 70 years before his arrival, none of the previous presidents of the United States had been in office. As the president of the United States to face the victims of the nuclear explosion, Obama's trip to Hiroshima has been hotly debated since the beginning. The outside world is more concerned about whether Obama will apologize. Japanese right-wingers directly demand that he apologize to thousands of victims of the nuclear explosion. In response, Obama made it clear in an exclusive interview with Japanese media before leaving that he would not apologize,"It is the job of historians to review the right and wrong of dropping the atomic bomb back then." Moreover, he once again confirmed his attitude with his actions in Hiroshima: he only talked about "non-nuclear" and would not "apologize." In his Hiroshima speech, Obama only used "cruelty" and "memory will not be erased" to describe the nuclear explosion, and expressed his determination to achieve a "nuclear-free world." Japanese Prime Minister Shinzo Abe, who accompanied the visit, said on Obama's visit to Hiroshima: "The President of the United States has exposed the truth about the nuclear explosion and re-expressed his determination to achieve a nuclear-weapon-free world. This has brought great hope to people around the world who firmly believe in a nuclear-weapon-free world." In fact, most victims of the Japanese nuclear explosion hold a positive attitude towards Obama's trip to Hiroshima and are not bitter about "no apology". A survey by Japan's Kyodo News Agency showed that nearly 80% of victims did not believe that the United States needed an apology, especially if asking for an apology would cause Obama to cancel his visit. However, Obama's trip to Hiroshima triggered protests from South Koreans. A group representing South Korean survivors of the Hiroshima nuclear explosion wrote to Obama,"We hope that your visit to Hiroshima will not be used to advance the Abe administration's attempt to portray Japan only as a victim." Some South Korean media even called the trip to Hiroshima "reckless and regrettable." 65 years of allies: Obama and Abe have their own plans. Obama and Abe's backs. The "ally" relationship between the United States and Japan began with the US-Japan Security Treaty, which came into effect in 1952. However, for more than 60 years, as former victors and defeated countries, the "knot" of the war trauma between the United States and Japan has not yet been completely resolved. Each of these allies, who have long "relied on" each other, has its own calculations. The "boat of friendship" between the United States and Japan is not smooth sailing and unbreakable. Obama has repeatedly touted the trip to Hiroshima as a "journey of reconciliation"-in his view,"the perfect story of a country that was once enemies of each other becoming the strongest ally." However, there is a voice in both Japan and American society: Although the United States and Japan are allies, the "World War II" knot between the two sides has never been truly resolved. It is worth mentioning that Obama, who won the Nobel Peace Prize for his efforts to promote denuclearization, is most concerned about promoting the ideal of a "nuclear-weapon-free world" and providing himself with more political legacy while his term is short. Obama once said,"As the only country that possesses nuclear weapons and has used nuclear weapons, the United States bears moral responsibility for its actions." The trip to Hiroshima can be said to be an excellent opportunity to interpret "moral responsibility" and a "nuclear-free world." For Abe, Obama's visit to Hiroshima, the nuclear-bomb site, helped downplay Japan's aggressive atrocities during World War II. Some analysts said that Japan has been committed to inviting foreign dignitaries, especially U.S. dignitaries, to visit the nuclear explosion sites of World War II. On the surface, it is to appeal to the world to "eliminate nuclear weapons." In fact, it is trying to dress itself as a "victim" of World War II and downplay Japan's responsibility for launching a war of aggression and the damage caused to other countries. However, in response to Japan's invitation to foreign leaders to visit Hiroshima, China Foreign Minister Wang Yi said on the 27th that Hiroshima deserves attention and Nanjing should not forget it. Victims deserve sympathy, but perpetrators can never shirk their responsibilities. Asia-Pacific rebalancing: Abe's face, Obama's wife Obama and Abe shake hands at the G7 summit. The first time a U.S. president visited Hiroshima, the nuclear-bomb site, should be the happiest person than Abe. At the end of his term, Obama used this "first visit" to fulfill his "nuclear-weapon" ideals and also sold Abe's government, which attempted to downplay the Japanese war. A great face. Of course, the most important point is that both sides hope to strengthen the Japan-US alliance through this. Japanese media analysis said that Abe is striving to demonstrate the strengthening of the Japan-US alliance by allowing Obama to visit the nuclear-bomb site of Hiroshima. The Abe government has always been committed to promoting close relations between Japan and the United States. From integrating the US and Japanese troops to implementing the new security bill, Abe's various measures to lift the ban on collective self-defense rights have been recognized by the United States. Moreover, some Japanese Liberal Democratic Party members admitted that Obama's trip to Hiroshima will undoubtedly improve the performance of Abe's ruling coalition in the election. In the Senate election to be held in July this year, the Abe government does not dare to underestimate the challenge of "organizing efforts" by opposition parties. On the other hand, while Obama expressed condolences to all war victims in Hiroshima and advocated a "nuclear-free world", he also hoped to strengthen the Japan-US alliance through the Hiroshima trip, thereby further wooing Japan to contribute to its "Asia-Pacific rebalancing" strategy.