Nearly two and a half centuries ago, European settlers built their first nation on the North American continent, the United States of America. However, in these two hundred and fifty years, the relationship between Europe and the United States has always been fluctuating and the mutual attitude of their peoples has continuously changed. What then are the reasons for this fluctuating relationship? We all know that people in Europe and those in the United States are from the same race, the same origin, and may all have the same kind of nationalism. For this reason, whenever one side of the Atlantic Ocean encounters problems or difficulties, the other side will ultimately give its support and solutions. This can be illustrated by the post-World War II period. During that time, the US government supported its European brothers through capital and technology to rebuild cities and also to resist the expansion of communism. Even in the last years after the Cold War, NATO accepted the membership of some former communist countries in Eastern Europe. Frequent financial aid has been sent to these countries for the rapid change and development of their governments. On the other hand, the European people showed their sympathy and compassion to the United States for the September 11 incident. Most European countries give their support to the United States on the issue of terrorism. Furthermore, some of them even gave their military support to the war on terrorists. All this can strengthen the relationship between Europe and the United States. However, can these events be the true reflection of the relationship between them? The answer is no. Many years after World War II, younger generations have no idea what the United States has done for their countries. Instead of thanking the United States, they increasingly criticize the growing influence of the United States on their cultures and governments. Just like the protests of the American people before the creation of the United States, many Europeans are now protesting that their governments would become the puppets of the United States. Furthermore, they also protest against the American government's withdrawal and rejection of some international agreements and treaties, such as the Kyoto Agreement and the Anti-Ballistic Missile Treaty. They think that these decisions are only good for the United States, without any consideration for Europe. On the other side of the ocean, the United States.