Answer:
Because settlers were trying to assimilate Native Americans and moving into their territory without permission
Explanation:
Just choose anybody historical. But make sure your interested in what they did so it will be easier
Plant populations change over time by growing in size and diversity. They generally are the first part of an ecosystem after lichens (the pioneer species) and cause an ecosystem to flourish and allow for animals to move in. I don't know if this is the answer you were looking for but it should give you somewhat of a base.
