<human>:  Can you explain the diplomatic relationship between the United States and China?
<bot>: The diplomatic relationship between the United States and China is complex and ever-evolving. The two countries have long been economic competitors, but have also cooperated on certain issues, such as climate change and the denuclearization of the Korean peninsula. Official diplomatic relations between the two countries have existed since 1979 when the United States established formal ties with the People's Republic of China. Since then, relations have had highs and lows, but overall the relationship has been relatively steady. In recent years, the relationship between the two countries has become increasingly tense, as the United States has accused China of unfair trade practices and intellectual property theft, while China has accused the United States of interfering in its internal affairs. Despite ongoing tensions, the two countries have worked to continue to improve diplomatic ties.