You have to go back to the 2000 Gold Cup to find a winner who isn’t Mexico or the United States, but 2019 sees both of those sides enter the tournament with more questions than answers, and they’ll be hunted down by teams full of dynamic young talent threatening to upend the order in North and Central America. The U.S. enter the tournament as defending champions, but all has not gone well for the Stars and Stripes since lifting their continental crown in 2017. After failing to qualify for last summer’s World Cup, the Americans jettisoned their second manager of the 2018 cycle and ushered in a new coach in Gregg Berhalter and a new generation of players to restart the program. (So far, the results have been less than promising.) Mexico, meanwhile, have a new coach of their own in Gerardo “Tata” Martino. While the former Atlanta United, Argentina and Barcelona manager inherited a much more stable situation than what awaited Berhalter north of the border, Martino must cope with a Gold Cup squad shorn of its biggest players, whether through injury or personal reasons. ESPN FC’s Arch Bell dives into the biggest questions facing the U.S. and Mexico,…