During the first two decades of the 20th century, relations between the United States and Japan were marked by increasing tensions and attempts to reduce the risk of diplomatic conflict. Each side had territory and interests in Asia, which they feared would threaten the other. U.S. treatment of Japanese immigrants and competition for economic and trade opportunities in China have also exacerbated tensions. At the same time, the territorial claims of each Pacific country have served as the basis for several agreements between the two nations, with each government striving to protect its own strategic and economic interests. Korean historians believe that the United States recognized Japan`s sphere of influence in Korea during the discussions; In return, Japan recognized the U.S. sphere of influence in the Philippines. However, American historians who investigate official records report that no agreement has ever been reached - the two men have discussed recent events, but have not found any new policy or agreement. Both reaffirmed the well-known official policy of their own governments. In fact, Taft was very careful to point out that these are his private opinions, and he was not an official representative of the U.S.
government (Taft was Minister of War, not Minister of Foreign Affairs).   In 1919, Japan and the United States again clashed in the League of Nations negotiations. The United States refused to accept Japan`s request for a racial equality clause or an admission of equality between nations. In addition, the Treaty of Versaille gave Japan control of valuable German concessions to Shandong, which caused an outcry in China. This, combined with the growing fear of a militant Japan, contributed to the league`s alliance defeat in the U.S. Senate. Persistent problems preventing accommodation have continued to be racial equality (particularly with respect to the treatment of Japanese immigrants in the United States) and differences in the management of expansion in Asia. Despite numerous efforts to reach agreement on these points, Japan and the United States were again divided in the early 1920s. There were three essential areas of understanding in the conversation. First, Taft told Katsura that some pro-Russians in America publicly claimed that the recent war between Japan and Russia was a prelude to Japan`s aggression against the Philippines.