<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The international relationship between the People's Republic of China and the United States of America is quite strong yet complex . Both countries have an extremely extensive economic partnership, and a great amount of trade between the two countries necessitates somewhat positive political relations, yet significant issues exist . It is a relationship of economic cooperation, hegemonic rivalry in the Pacific, and mutual suspicion over the other's intentions . Therefore, each nation has adopted a wary attitude regarding the other as a potential adversary whilst at the same time being an extremely strong economic partner . It has been described by world leaders and academics as the world's most important bilateral relationship of the 21st century . </P> <P> Relations with China began under George Washington, leading to the 1845 Treaty of Wangxia . The United States was allied to the Republic of China during the Pacific War, but broke off relations with China for 25 years when the communist government took over, until Richard Nixon's 1972 visit to China . Since Nixon, every successive U.S. president has toured China . Relations between the two countries have generally been stable with some periods of open conflict, most notably during the Korean War and the Vietnam War . Currently, China and the United States have mutual political, economic, and security interests, including but not limited to the proliferation of nuclear weapons, although there are unresolved concerns relating to the role of democracy in the government in China and human rights in both respective countries . Relations with China have strained under Barack Obama's Asia pivot strategy, ongoing maritime disputes in the South China Sea, and a trade war in 2018 . </P> <P> As of 2017, the United States has the world's largest economy and China has the second largest, although China has a larger GDP when measured by PPP . China is the largest foreign creditor of the United States . Public opinion of the other country tends to fluctuate around 40 to 50 percent favorability . As of 2015, China's public opinion of the U.S. is at 44%, while the United States' public opinion of China is somewhat lower at 38% . The highest recorded favorable opinion of the United States was 58% (2010) and the lowest 38% (2007). Conversely, the highest recorded favorable opinion of China was 52% (2006) and the lowest 35% (2014). </P>

When did the united states start trading with china