Because maybe they have grown up there and want to go to a different place and see more of the world instead of just staying in one village
their whole lives.<span />
The land was free and perfect for farming, if settlers survived the journey to Oregon the land was all theirs. But not only did the US like it, Britain and Russia also liked it. So the US told people to move there ASAP so it would officially be claimed by America.
Answer:
no they did not join the League of Nations
Climate changes affect what plants grow in a certain area . therefore it defines what animals will be there.climates also affect water levels in the ocean