This summer is Obama's diplomatic season. First reconciliation with the enemy Cuba, to resolve the United States peripheral diplomacy half a century since the most difficult problems; then to promote the Iranian nuclear issue reached a comprehensive agreement to become diplomatic efforts to solve complex international hot issues model.

Of course, the follow-up to the two diplomatic events will not be smooth, conservative US Congress is likely to block the appointment of ambassadors in Cuba, the United States may also accept the Iranian nuclear issue agreement to create obstacles. But in any case, these two things are enough to become the Obama administration in the diplomatic field the most dazzling results.

Cuba, Iran, the two problems have a long history, can be traced back to a few decades ago, the United States as president of all want to solve these two issues on the make, but no end. And ultimately qualitative change in what happened to Obama? There are three main reasons.

First, the international pattern of power changes to the parties to solve the problem to bring a sense of urgency. The United States is increasingly aware of the difficulties of maintaining global leadership, and more use of clever strength, attention to the legitimacy of their own behavior and international appeal, to seek multilateralism. While Cuba, Iran sitting on a wealth of resources, but mainly because of foreign policy reasons in the economic development of the pace of slow. It should be said that the changing times, the parties are more aware of what they really want.

Second, the Obama administration's pragmatic diplomatic line. Obama has just taken office on the occasion, from Bush's hands took over a severely damaged American diplomacy. Obama is well aware of his predecessor's tough style, the first priority to make the United States diplomacy in the passive, excessive use of force but weakened the US global image and leadership. Therefore, the first term of its foreign policy can be described as "withdrawal", withdraw from Iraq, Afghanistan, to make a moderate strategic contraction. The second term of foreign policy should be "talk", to negotiate priority, to avoid direct military intervention, especially to send ground forces, which is evident on the Syrian issue. Although it was criticized as weak, but this achievements of the Cuban, Iran two problems to solve.

Third, Obama's personal factors. Obama came from the grassroots, the twilight of childhood life of his later character created a subtle influence, he was cautious, but not decisive, execution slightly less. Coupled with his career as his former Bush, Clinton, George W. Bush served as governor or federal government officials, but only served as a lawyer and senator, lack of administrative experience. This was his weakness, but to some extent also became his advantage: such as attention to listen, accept different opinions, safe and secure. Manifested in foreign policy, he more to avoid the use of force, instead stressed the importance of the negotiations.

In addition, one of the most pressing reality is that, in the face of the House of Representatives controlled by the Republicans, Mr Obama realized that it was difficult to make a difference in the internal affairs and instead sought a breakthrough in the diplomatic sphere and that he left a political legacy.

In short, a slap shot does not ring. Luhanyi, Castro is also facing internal pressure, after all, the people eat the problem is the most real needs, their ideas and Obama coincide, shake hands and in reason.

On the issue of settling diplomatic relations with Cuba and Iran's nuclear deal, Obama has received strong external help. It seems that the solution to the two problems comes from the right place and. Do not know whether the United States is currently the remaining "opponents" - whether the North Korean and Russian leaders can be touched, after all, the current Obama seems to be the history of the United States "best talk" leader.