I didn't know CONCACAF had a U-13 Champions League, but http://www.concacaf.com/en/article/2018-scotiabank-concacaf-under-13-champions-league-draw-results says it's the fourth one. The groups are: "Group A Juniors Tampico (Mexico) Montreal Impact (Canada) A.D. Liga Deportiva Alajuelense (Costa Rica) Santa Ana (El Salvador) Group B CECAF San Luis (Mexico) Costa Rica 2 San Miguel (El Salvador) Real Esteli F.C. (Nicaragua) Group C Cantera Yucatán (Mexico) LAFC (United States) CD Plaza Amador (Panama) Mount Pleasant Academy (Jamaica) Group D Aguilas del Uagro (Mexico) Honduras 1 San Juan Jabloteh (Trinidad & Tobago) Toronto FC (Canada)" Canada has more clubs than USA.