The article is devoted to actual issue - the analysis of the United States of America experience in the field of organization of counteraction against internal and external terrorist threats. In article analyzed antiterrorist mechanisms of different periods of the USA history as well as changes in approaches of US administrations in solution of the abovementioned problems after events of September 11, 2001. The analysis can be considered further for comparison with national complexes of measures in antiterrorist field.
