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West of the Mississippi was considered the Frontier.
Furs were most common along the western frontier.
No.
The western frontier was not so much closed as inundated with so many people that it was no longer a "frontier". The urge to explore and go further into parts unknown moved people to start exploring the pacific ocean and trade routes to Asia/Australia/Hawaii once California and Oregon and Washington were conquered.
increase of homesteads with fenced boundaries