From the Document: "Trade is critical to the U.S. agricultural sector: Exports account for about 20% of total U.S. agricultural production. Some commodities--such as cotton, wheat, and soybeans--have export shares of nearly 50% or greater. As a member of the World Trade Organization (WTO), the United States has committed to abide by WTO rules and disciplines, including those that govern domestic farm policy."
CRS In Focus, IF10983
Congressional Research Service: https://crsreports.congress.gov/