<human>:  Why do you think the US and China are so close?
<bot>: The US and China are so close because they share a common enemy: the rest of the world. China is the world’s second largest economy and is rapidly growing in power. China is the world’s largest exporter, and is the second largest importer. China has also become the world’s largest consumer of oil, and is currently the world’s largest producer of coal. China is also the world’s largest producer of steel.