the unification of a hemisphere

I've always thought the Americas are similar to Europe, the '' Union of the Americas '' could emerge similar to the European Union model. Here are some features in this alternative union that I'm looking for:

- the alternative union must have a single currency and this currency can not be the US dollar

- have open frontiers between the members and the passport have written in them '' union of the americas ''

- This nation can coexist with the other blocks of our timeline, but it must be the most powerful union

- All members are sovereign states

POD may be at any time, but preferably after WW2. I'm not asking you to write a timeline. I just want to have a discussion if the American Union can exist. The probable candidates, I think, would be the Spanish America unified and the united states annex the canada and the brazil remains an empire thus creating a balance in the americas with 3 great powers leading to the union of americas.
Another would be Brazil restores the monarchy and with the passage of time becomes the second largest western power after the USA and other infinite possibilities.
 
Maybe in a world where the USA remains isolationist it tries to form a sphere of influence in the Americas?
 
The problem is any Western Hemisphere union is just a term for "Greater United States". The US has always had a higher GDP than the rest of the Americas combined (or at least since the early 19th century), and population-wise consists of just under 1/3 of the Western hemisphere's population, although at one point the American population was higher than the rest of the Western hemisphere combined. At the same time, the United States has powerful interests against such cooperation, to where the term "North American Union" and its supposed currency the Amaro was at one point a popular conspiracy theory, and for something that actually exists, go look at NAFTA. And it goes without saying that both Canada and Latin America have a long history of opposition to such unions and domination of the United States this sort of program would entail.

Such an idea is not politically feasible in the United States, nor in most other countries.

To have this work, I think you'd need a very early POD where the United States either never forms or rapidly falls apart (as Latin America did).

I've always thought the Americas are similar to Europe, the '' Union of the Americas '' could emerge similar to the European Union model.

That's just not true at all, aside from the ethnic, linguistic, religious, and cultural heritage of Europe. The geopolitical situation is far different, thanks in large part to the existence of the United States.

- the alternative union must have a single currency and this currency can not be the US dollar

Why would they not use the dominant currency in not only the hemisphere, but the world, when it's already the official currency in not just the US, but Ecuador and El Salvador? The American economy has always been dominant in the Western hemisphere.

- have open frontiers between the members and the passport have written in them '' union of the americas ''

Unlimited immigration from Mexico is sure going to go over well. Although to be fair, it would just be making the situation of that border which existed before the early 20th century official. I'm sure there's other borders which letting them be as wide open as in Europe would be highly controversial and thus politically unfeasible.

- This nation can coexist with the other blocks of our timeline, but it must be the most powerful union

I would say a Greater United States not being the most powerful union would be a very strange situation. That's why whenever you see a similar concept in fiction it's always matched by things like a super-European Union and/or another large union in Asia.
 
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