Vietnam is a weak country in Southeast Asia, with a territory of about 33, square kilometers and a population of 98.26 million. In 221, Vietnam's total economic output was US$ 362.619 billion, with an average GDP of US$ 3,7. Vietnam currently has a military strength of 482,, and its military expenditure is more than 7 billion US dollars. The United States is the world hegemon, with a total GDP of 23 trillion US dollars in 221 and an average GDP of 69,3 US dollars. The current military strength of the US military is 1,429,995, and the military expenditure in 221 is 81 billion US dollars. The data in all aspects are far stronger than that in Vietnam. The overall strength and military strength of the United States are stronger than Vietnam, but because the United States has suffered losses from Vietnam, it makes the United States afraid of provoking Vietnam. Second, Japan

Japan is now the younger brother of the United States, and it is respectful to the United States, but the United States is quite afraid of this younger brother, fearing to relax its bondage to Japan. Japan is one of the few countries that have actively attacked the United States in history. During World War II, Japan invaded China on a large scale. At the same time, Japan signed an alliance agreement with Germany and Italy to carve up the world. The victory of Germany and Japan is not conducive to the interests of the United States, so the United States began to provide weapons and materials to China, the Soviet Union, Britain and other countries to fight against fascist countries in accordance with the Lending Act. The United States also imposed an embargo on crude oil and steel products on Japan, which hit Japan economically and left the Japanese army in trouble on the battlefield. Third, Switzerland

Switzerland is a weak country in Europe, with a territory of only 41,284 square kilometers and a population of only 8.66 million. Its strength is very weak, but the United States dare not provoke it. Switzerland is a well-known neutral country in the world. It does not depend on big countries, does not form alliances with other countries, and does not intervene in international disputes. Switzerland does not attack other countries, but it has armed itself and made other countries afraid to attack itself. Switzerland implements a militia system in which all the people are soldiers and mobilized by the whole people. All healthy male citizens aged 2-34 in Switzerland must join the army. Switzerland has also built a large number of underground bunkers at home, which can accommodate the entire population of the country. Whoever dares to attack Switzerland will face a Switzerland where everyone is a soldier and is as strong as a bunker. At the same time, Switzerland is at the intersection of Germany, France and Italy. If the United States attacks Switzerland, it will cause heavy losses to the United States if it is attacked by other powers. Most importantly, Switzerland is a safe haven for investors, and important people in many countries will deposit their money in Swiss banks. An American attack on Switzerland will damage their assets, make the United States a target of public criticism and be criticized by the international community. Iv. Russia

The United States is a country with a short history, only more than 2 years. During this period, the United States has fought with many countries, such as Britain and Germany, but the opponent that the United States fears most is the Soviet Union. The Soviet Union has millions of troops and powerful military forces. More importantly, it has more than 1, nuclear bombs, which is enough to destroy the United States. In 1962, the Soviet Union also quietly installed a nuclear bomb in the yard of the United States in Cuba, which finally triggered the Cuban missile dilemma and was almost destroyed by the United States, which made Americans wary of the Soviet Union. In 1991, after the disintegration of the Soviet Union, Americans celebrated all over the country, but Russia, which inherited most of Soviet property, still frightened the United States. Today's Russia, in terms of economic strength and military strength, can't be generalized with the Soviet Union, and it is far less than the United States now. However, Russia has thousands of nuclear bombs, as well as North Wind-class nuclear submarines, Delta -4 strategic nuclear submarines, Yasen-class nuclear submarines, sarmat's long-range strategic ballistic missiles, Satan's intercontinental missiles and Jarls's ballistic missiles. It still has the ability to destroy and crush the United States, which makes the United States punish Russia everywhere, but from V. China

China is a world power with a land area of 9.6 million square kilometers and a population of 1.4 billion, and it is also the second largest economy and military power in the world. Although the overall strength and military strength of the United States are above that of China, China is not afraid of the United States, and the United States does not dare to attack China. In 195, after the conflict broke out on the Korean Peninsula, the United Nations troops led by the United States invaded Korea and participated in the Korean Civil War. Subsequently, regardless of China's warning, the US military crossed the 38th parallel and roasted the war to the Yalu River and our territory. Our country and North Korea are at a loss for lips and teeth. If the United States wins North Korea, it is possible to deploy troops to our border and threaten our security. Therefore, China has made a decision to resist US aggression and aid Korea. After hundreds of thousands of volunteers went to the Korean battlefield with great momentum, they instantly reversed the battlefield situation. China defeated the US military several times and drove the US military back to the 38th parallel. Unwilling to swallow the consequences of defeat, the American army began to fight back on a large scale after increasing its troops. The US military's well-equipped and well-trained strategy caused serious casualties to the volunteers. However, the soldiers of the volunteers were tenacious and fought for every inch of land with the US military, which blocked the cold attack of the US military and finally dragged the US military into the danger of war, making it impossible for the US military to defeat the volunteers. The War to Resist U.S. Aggression and Aid Korea was the most impressive war in China after the founding of New China. China defeated more than ten countries including the United States, including France and Britain, which had bullied our country. The United States is also afraid to underestimate our country here.