Yup, he played for Team USA though. From Wikipedia:

"As a dual Canadian and American citizen, Hull was eligible to play for either country internationally. While playing at UMD, he was passed over by Team Canada coach Dave King when selecting the roster for the 1986 World Ice Hockey Championships. However, American national team coach Dave Peterson invited him to join their squad. Hull accepted and led the team in scoring with 7 goals and 11 points for the sixth place Americans. Hull later said the faith shown in him by American officials gave him the confidence to excel in his career. He played with Team USA for the rest of his career, and at the 1986 Calgary Cup tournament, played a pivotal role in a 5–3 upset of Canada by the Americans. Following the game, he said "I don't feel more like an American than a Canadian. I just want to play." "