Sino-American relations refer to the diplomatic, economic, and cultural interactions between China and the United States. This relationship has evolved significantly since the mid-20th century, particularly during the era of Nixon's foreign policy, which marked a shift from hostility to engagement with China. The establishment of formal diplomatic ties in 1979 laid the groundwork for cooperation in various fields, while also highlighting ongoing tensions over issues such as trade, human rights, and military presence in the Asia-Pacific region.