alternatehistory.com

So recently I have been playing with some world building ideas and one of them includes a large, geographically diverse continent dominated by a single massive country. This brought me to thinking about how US foreign relations would work if the country dominated everything north of the Darien Gap.

Through various means the US has managed to attain Canada and has managed to take over the entirety of central America and the Caribbean. Perhaps some islands could still remain in European hands or as separate entities (like Haiti). Assume these borders are established before 1900. How do US relations work with the rest of the world? With no Mexico, there would be no Zimmerman Telegram. With no Canada, US-British relations might have not been very strong. With illegal immigration from south america having to move through a very narrow and treacherous land route that could be much easier blocked and sea immigration being the only real option, there would be little flexibility for those seeking a new life from the south. The US is also just bigger in every way.

Would the US become more insular and neutral?

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