We don't know who " these people " are so can't answer the question.
They didn't migrate. They had an empire of 15,000 people.
large groups of people migrate becuse they want to explore different area or the climate of ones area
Cultural Diffusion
because they thought that new zealand was a better place
people migrate to different regions to make a better living.
When people migrate the population that they left becomes smaller. When these people migrate to where they are going to that population becomes larger.
Spain and France.
Lack of food (for one) will make people migrate. Also, weather or temperature will make people migrate.
its hard for people to migrate because of money
they do both, people also migrate to France.
People may migrate from one region to another for economic opportunity. Other people migrate because they have family in different areas.
well when people migrate they can be illeagal in some places like Mexico