For much of the test, only seven points separated the sides, but the Black Ferns have shown their class to fend off a courageous Canadian outfit 52-21 at Ottawa.
Just as the hosts threatened to play spoilers, the world champion NZ women scored three tries in the final 20 minutes to end the contest.
Centre Amy du Plessis and winger Mererangi Paul grabbed two tries apiece, as New Zealand solidified their spot atop the Pacific Four table.
The Black Ferns showed their attacking prowess from the outset, determined to shift the ball from the first whistle.
Flying winger Katelyn Vaha'akolo almost went over from the game's opening kickoff, but was tackled just short, as lock Chelsea Bremner reaped the rewards with a five-pointer.
Bremner was in the thick of it again just minutes later, as her lineout take prompted the Canadians to infringe at the maul, with fullback Renee Holmes unable to convert the penalty.
New Zealand wouldn't have to wait long to tick the scoreboard over again, with first-five Ruahei Demant pulling out a brutal fend on her way to the tryline.
Canada's defence continued to struggle against the wave of black attacks, with du Plessis inspiring another NZ try. The dancing midfielder made the break, before tumbling to the turf, but showed tremendous skill to get the ball away for a Paul try,
After an error-riddled 10 minutes, Canada finally made inroads into the NZ defence, with inspirational captain Sophie de Goede powering her way over for her side's first try.
Her effort was followed by another courageous run by fellow loose forward Fabiola Forteza, who broke away from the lineout drive to touch down and reduce NZ's halftime lead to 21-14.
The early signs of the second half suggested more of the tit-for-tat showcase witnessed in the first 40 minutes. Du Plessis was rewarded for all her hard work with a five-pointer of her own, following a snipe by halfback Arihiana Marino-Tauhinu.
As they had done all match, the hosts hit back, with prop Olivia DeMerchant crashing over, after Canada recovered from an initial Black Ferns shove at the scrum.
With the match evenly poised, the Ferns showed their class to up the ante, scoring a further three tries in the final 20 minutes.
Paul grabbed her second, with the Black Ferns making use of the overlap and Holmes making no mistake with the final pass to send the winger over.
After playing the role of provider, Holmes added to her points tally with a try, after pouncing on a du Plessis grubber in the in-goal area.
Du Plessis soon grabbed her second, after being denied just moments before, with debutant Kelsey Teneti also touching down to cap off a clinical second half.
New Zealand are the only unbeaten side remaining in the Pacific Four and will play the USA in their final match on Saturday.
Black Ferns 52 (Paul 2, du Plessis 2, C.Bremner, Demant, Holmes, Teneti tries; Holmes 6 conversions) Canada 21 (De Goede, Forteza, DeMerchant tries; De Goede 3 conversions)
