"Our history has been shaped by some dark and disruptive events but we have also been shaped by our responses to those challenges, " she said.
"We live in a country that is so much more diverse than it was 100 years ago. Our diversity is a source of strength and in the face of violence and hatred we resolve not to be divided."
Minister of Finance Grant Robertson shared a reading from Polish refugee Irena Coates who was brought to Pahiatu as a child after the war, her and her sister were the sole survivors of their entire family.
The crowd then sung along to the Australian National Anthem, followed by New Zealand's.
A youth representative from New Zealand, Australia and Turkey each performed a reading to the crowd.
The Ambassador of the Republic of Turkey, Ahmet Ergin, was in attendance, as was the High Commissioner of Australia, Patricia Forsythe.
They, along with dozens more international representatives, laid wreaths at the Pukeahu National War Memorial.
The service concluded with a peace prayer by chaplain Di Woods.