imbalance in current trade - 67% of the trade deficit according to this guy is China, and the amount of money the US owes China. I'm not well-versed in this kind of stuff so I cant speak to the validity of the data but found it an interesting watch - the stuff about forced transfer agreements so China can copy us (9 minute mark) was particularly interesting to me:

https://www.youtube.com/watch?v=DxN12jzHrqI