But they were the first to hit the back of the net in the 26th minute after Aminat Bello was clipped on the Americans’ goal area and a VAR review adjudged the contact impactful enough for a penalty.
Omamuzo Edafe stepped up and send Valentina Amaral the wrong way.
Nigeria was pegged back in the 40th minute, however, after Amalia Villareal’s shot deflected off Comfort Folorounsho to buzz past Faith Omilana and into the net.
The scoreline remained one-all throughout the regular time as the Flamingos withstood the pressure from the Americans.
The game tapered into a penalty shootout and Ella Emri and Mia Bhuta had their kicks skied and saved respectively by Linda Jiwuaku, Nigeria’s substitute goalkeeper.
Edafe scored the final penalty kick and sent Nigeria to their first-ever U17 women’s world cup semi-final.
Flamingos will face the winner of the fourth quarter-final between Tanzania and Colombia.