<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. The US and China are the two largest economies in the world and they both have a lot of influence in the world. For example, China and the US are the two largest trading partners in the world. They are also both allies in the UN Security Council, and they both have veto power there. The US and China are also both members of the G7, which is the group of seven most developed countries in the world.