[Paul R.]

We are China’s largest single country customer, but, we are only 18.3% of their total exports.

http://www.worldstopexports.com/chinas-top-import-partners/

However, the US does have sizable influence in the banking system. Perhaps threats of this were hinted at: China went along with the Security Council Resolution on NK this time. This was touted as a “big win” for Trump on the 10 pm News I happened to be watching earlier. (NBC report on local newscast — will someone @ NBC get fired?)

[TigerLikesRooster]

Using the statistics given in the linked site, China's trade surplus with U.S. is 33% of the total surplus after Hong Kong. Hong Kong is really a part of China. If you exclude Hong Kong, U.S. accounts for 52% of China's trade surplus.

China exports to many countries, but also imports from them a lot. If U.S. export is shut off, the impact is will be devastating.