As you mentioned 2017, attached is a chart comparison of S&P500 and an ETF of Shanghai index, China A shares (in green - ASHR) If stock market index price is anything to go by, USA is clear winner.
View attachment 206771
Wow it's impressive how S&P outperformed ETF in recent months.
Here some current data I extracted from Bloomberg:
During the first quarter of 2018, 28,63% of Chinese exports went to the US, On the first quarter of 2019 this number lowered to 25,57%.
1st Quarter of 2018, 14,65% of US exports went to China, for the same period this year the percentage lowered to 10,34%.
It seems like the US has performed better than China in diminishing its dependency on the other. 1/4 of Chinese exports still depends on the US, that's a large amount for the country that is your current enemy. If this percentage is going to be decreasing 3% per year from now, the US still has a lot of time for putting pressure on China in the trade field.