What if the Americas (North America,Central America and North America) had no borders?

An Americas Union...Something like what they did in Europe. One currency, free trade and free pass to any country? Politically speaking what would be the advantages and disadvantages of that change? * US and Canada has a great economy to offer. * Central America has a Strong work force. * South America is... show more An Americas Union...Something like what they did in Europe.
One currency, free trade and free pass to any country?
Politically speaking what would be the advantages and disadvantages of that change?

* US and Canada has a great economy to offer.
* Central America has a Strong work force.
* South America is the biggest on Natural resource.
Update: Adding.... Let's not forget the benefits of the free trade. How it would help the US, Canada and Latin America. Latin America would benefit tremendously from it. More international corporations would settle in making more jobs available and increasing the quality of life. There wouldnt be anymore reason to... show more Adding....
Let's not forget the benefits of the free trade. How it would help the US, Canada and Latin America.
Latin America would benefit tremendously from it. More international corporations would settle in making more jobs available and increasing the quality of life. There wouldnt be anymore reason to leave their countries. Canada would benefit from labor which is a major problem on their todays economy. US would benefit from Natural resources. Brazil is already autosufficiente in Oil and is already exporting, so are other south american countries. Brazil is also a leader on Ethanol which is an alternative of gasoline. Every change has to go into adaptation. Border control would still be needed at least on the beginning. But I think everyone would benefit from it .
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