The New Zealand women's rugby side is on course for a fifth World Cup after toppling the United States 45-12 in the semi-finals in Belfast.
Portia Woodman enjoyed a try-scoring feast on the wing, scoring four tries.
The Black Ferns didn't have it all their own way as they only led 15-7 at halftime.
But they took control in the second half, playing the majority of the game in the opposition half and dominating possession.
The New Zealanders went down to 14 players for 10 minutes late in the game when Linda Itunu was sin-binned for a high tackle, but they still managed to score a couple of tries in her absence.
The Black Ferns scored seven tries in total.
Woodman has now scored 13 tries in the tournament - twice as many as the tournament's next leading try-scorer.
Black Ferns captain Fiao'o Faamausili said she was overjoyed to be in the final.
"I'm just so excited... and full credit to the USA team, they kept battling right through to the 80th minute, so we have a lot of respect for them and they really gave it to us," she said.
Faamausili said the match was much tougher than the scoreline suggested.
"The girls had to dig deep and we have been training really hard throughout the week [so] our preparation has been on point and I couldn't be any prouder of the way we played today.
"We went down to 14 players and then we had to step it up another notch so I'm very, very happy."