WEST PALM BEACH, Fla., June 21, 2019 /PRNewswire/ -- U.S. Polo Assn., the official brand of the United States Polo Association (USPA), announced it will serve as Diplomatic Sponsor for the 2019 District Cup, an annual polo event held on the National Mall at West Potomac Park in Washington, D.C. Scheduled for Saturday, June 22, the event will benefit The Trust for the National Mall's Campaign to Rebuild the U.S. Park Police Horse Stables. U.S. Polo Assn. will provide custom designed performance jerseys for all four teams participating in the event that include representation from the United States and Mexico.