Apart of the U.S. development program, Stoa was named to the United States Team for the 2005 U18 World Championships. Using his imposing frame, Stoa recorded 3 assists in 6 games to help the U.S. capture Gold. Stoa was also named to the U.S. Team for the 2007 World Junior Championships in Mora, Sweden. Stoa played a checking role with the Americans, and scored 2 points in 7 games to help earn Bronze.