D.C. United connects to Philadelphia Union in 3 degrees through coaching, DP transfer and shared players. First, D.C. United links to New England Revolution via coaching: Bruce Arena managed D.C. United (1996–1998) and New England Revolution (2019–2023). Then, New England Revolution links to Toronto FC via DP transfer: Jozy Altidore (Designated Player) moved from Toronto FC to New England Revolution (2022). The USMNT striker joined New England after a contract buyout from Toronto. Finally, Toronto FC links to Philadelphia Union via shared players: CJ Sapong played for both Philadelphia Union and Toronto FC