War on terrorism as an unintened barrier to trade?

          I agree that terrorist attack as a cause of unintened barrier to trade. After September 11, 2001 or called Nine Eleven, As the article state that President George W. Bush instructed the U.S. Coast Guard to take additional measures to guard bridge in U.S. harbors and sites such as the Statue of Liberty. American government launch a new security policy, therefore to secure their people and their important facilities.

However, more tightten security at air and seaports as well as land border crossing. Some disruption of trade flos during the immediate afterthe attack seemed almost inevitable, additional frictiona trading costs due to tightten sccurity have effect trade not only in North America but also world wide.