rivalry between the countries encouraging terrorism?

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in the present economic scenario almost 60 percent of the countries yet to be in the developing stage, Many of the developed countries utilising this underdeveloped countries people and encouraging for terrorism. One of the example is afganisthan. Pakistan utilising almost afgan people to attack india. Now even pakistan is suffering from terrorism. My discussion is today pakistan govt and army instructed the soldiers to shoot the american toops if they step into thier land? Is it the american are doing the right thing? It is the lesson to pakistan for encouraging terrorism? What should america do to eradicate terrorism?