You are wrong. Mexico-United States Border keeps Mexican labor and business from being more ferocious than American businesses in America. Borders have been protecting cultural states for a very long time in fact. 3200BC and before countries existed. It has and still does have alot to do with cultural tastes, and unlike how you expressed it, 'protecting the economy' from being formed against the wishes of the countries leaders. Borders come about for different reasons surely, but to reduce a border to an economic zone is just commie-aide.
