alternatehistory.com

So, I'm trying to figure out this timeline of mine, and I'm looking at the United States of the 19th century and wondering about a few things.

Namely:

1. Is it possible to keep the United States from getting a Pacific coastline from the 1830s onward?

2. If so, how difficult would it be and what would have to happen?

3. If not, why and what would be the latest point in time to avoid it?

4. What would be the effects of the United States only having one coastline?
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