Answer:
Many groups became extinct.
Step-by-step explanation:
The migration occurred because many of the colonists in United States forcefully take the land that previously owned by the native American group. Since they can't face the colonists due to the difference in their military technology, they're forced to migrate to other territories.
As they tried to do so, they faced new set of challenge. They were unfamiliar with the environment where they settled in, making it hard for them to find enough food to sustain the life of their members. This made their size keep getting smaller and many groups eventually became extinct.