The article "Free Trade Could Stem Illegal Immigration," July 11, raises what I believe is one of the most important aspects of the free trade issue. I realize that we can't have the whole world move to the US without risk of our economy and even our democratic institutions being destroyed. Yet a border with chain link fences and guards is at odds with our Declaration of Independence, which holds it self-evident that all people are created equal.I find it hard to reconcile that I can go into Mexico and enjoy the beaches and restaurants, whereas most of the people around me are not allowed to visit my city because we fear they would not be willing to leave. Having what amounts to an armed border ultimately undermines the ideals upon which our nation is founded. Mars Burnside, Tucson, Ariz. Letters are welcome. Only a selection can be published, subject to condensation, and none acknowledged. Please address them to "Readers Write," One Norway St., Boston, MA 02115.