Team USA has won back-to-back World Juniors championships for the first time thanks to overtime heroics from Teddy Stiga.
The Boston College forward and Nashville Predators draft pick scored eight minutes into Sunday's overtime to seal USA's 4-3 victory over Finland.
Earlier Sunday night, Finland had put the Americans on the back foot thanks to a first-period go-ahead goal from Tuomas Uronen of the OHL's Kingston Frontenacs.
Uronen's OHL teammate, defenseman Emil Pieniniemi, opened the second-period scoring to extend Finland's lead.
A puck shot by Brandon Svoboda through a crowded slot brought the Americans within one goal late in the second period.
Cole Hutson then beat Finnish goaltender Petteri Rimpinen with 30 seconds remaining in the frame to tie the game at three goals apiece.
Several Ottawa Senators players, including captain Brady Tkachuk, were in attendance at Canadian Tire Centre to celebrate Hutson's tying goal.
There was only one penalty called in regulation, with the officials essentially putting away their whistles after Finland opened scoring with a first-period power play goal.
Neither team could break through in the third period, leaving it up to 3-on-3 overtime to decide the gold medal winner.
Rimpinen was the first hero of the extra frame. He robbed Brodie Ziemer on a point-blank scoring opportunity three minutes in to keep Finland in the game.
Rimpinen stood tall again moments later when Ryan Leonard split Team Finland's defense and got in close for a shot at gold.
Stiga finally broke through to help Team USA claim consecutive World Juniors titles for the first time in history.
The Americans celebrated the historic win with a jersey honoring late Team USA star Johnny Gaudreau hanging by the bench, per FloHockey's Chris Peters.
The win capped off a stellar tournament for Boston University defenseman and Washington Capitals draft pick Cole Hutson, who set a record for American defensemen with 11 tournament points.
Hutson wasn't the only Capitals prospect who shone in Ottawa. BC winger Ryan Leonard, part of Team USA for both gold medal runs, earned the title of tournament MVP after recording five goals in seven games and assisting twice in the championship win.
Team USA's win capped off a busy day of extra-time thrillers in Ottawa. Czechia defeated Sweden in a shootout earlier Sunday to claim bronze with a 3-2 victory.
