From the Overview: "The U.S.-China trade dispute started in March 2018, when President Trump announced tariffs of 25% on steel and 10% on aluminum imports (with some flexibility on the application of tariffs by country) using presidential powers granted under Section 232 of the Trade Expansion Act of 1962. [...] China has retaliated with tariffs on a wide range of U.S. imports, including agricultural products. [...] During 2018 and 2019, the United States and China have taken a number of actions to escalate the trade dispute. This report provides a timeline of U.S. action and Chinese retaliation on U.S. agricultural products. It also provides a broad overview of Chinese retaliatory tariffs on U.S. agricultural products as of September 2019 and the proposed additional Chinese tariffs that may be in effect by December 2019. It concludes with key issues for Congress to consider."
CRS Report for Congress, R45929
Congressional Research Service: https://crsreports.congress.gov/