The Free Trade Area of the Americas is generally good for the development of poorer countries. The Free Trade Area of the Americas help poor countries by opening up trading to more wealth countries. With this, the poorer countries will have the ability to expand and grow their economies which will benefit the greatly.
Free but regulated trade would help poorer countries. After all, nearly every country has something inherent to their area that can't be obtained in another area of the world be it a geographical feature, some kind of plant life, or even just the quality of particular workmanship. The more poor countries are allowed to develop, the less of a threat they tend to become.