On January 15, 2020 China signed an Economic and Trade Agreement with the U.S. Within 30 days of signing this agreement, the Dow started a sharp decline on February 13, 2020. This was just one day before the trade agreement went into effect, as noted in the following article.
US-China phase one tracker: China’s purchases of US goods in 2020 and 2021
This trade agreement expires on December 31, 2021. Watch for a stock market decline to start in January 2022.