The United States faced several challenges that had varied impacts on the national security and at the international level, but the crisis of terrorism was and still is the major dilemma that beset the United States at all. That is because Its contents included all kinds of crises related to human rights and the crisis of relations between the United States and the rising competing powers. However, the war on terrorism has made the united states to get involved in all aspects of human rights like the restrictions on civil liberties and the simplest example of this is what is happening in prison without trials such as what occurs in Guanta´namo, on the other hand some of the rising powers get involved in supporting terrorism activities as a part of the competition with the United States . In response to this type of crisis that there is no agreement even on its concept which is traded in all media and various individual categories and official countries, I will address in these few pages this subject talking about the concept in terms of the differences and divergent views around , highlighting the importance and the sensitivity of this subject to the U.S. National Security financial issues and international commerce . Likewise, I will discuss the types and causes of terrorism trying to reach the most important implications of this case and its development on both international and domestic levels. Thus, I will try to review the liberalism and realism perspectives regarding this phenomenon trying to link the reasons to its causes in the practice of successive American Governments toward the crimes that involve terrorism. As well as emphasizing how effectively the instruments of power: Diplomacy, Intelligence, Military, and Economy (DIME) were applied to deal with such phenomenon. Concluding my recitative with a statement that answer the question why Terrorism is the most security challenge to the united states ?
A very large amount of terrorism definitions have been made by deferent organizations in the world. But the debate on the meaning of terrorism increased after 9/11 where the attack on the Twin Tower and the Pentagon took place by a group which is well known to most people nowadays as Al Qaeda. Therefore, statements were issued by the management and the concerned officials in the United States to declare a war on terrorism, at that point the need for a definition to terrorism appeared, then academics and specialists in this science were raced to find a definition to this phenomenon. And it is worth mentioning here that so far there is no uniform concept of terrorism has been agreed to inside the United States itself With all its institutions or in the international level . However, the definition of terrorism in oxford dictionary now is: " the use of violence and intimidation in the pursuit of political aims" . So it doesn't give a clear and explicit meaning to the concept, however it ignored by whom this use of violence has to be carried out, by individuals, groups or countries. Also a lot of attempts have addressed Terrorism were carried out by deferent organizations in the world trying to define the exact concept through the view and perspectives of their own stand points. And due to the huge amount and diversity of these definitions I will take one example from the United States itself which is the Federal Bureau of Investigations (FBI) definition for Terrorism, and the other definition for the United Nation. Thus, the FBI definition is: "International terrorism means activities with the following three characteristics: •
Involve violent acts or acts dangerous to human life that violate federal or state law; •
Appear to be intended (i) to intimidate or coerce a civilian population; (ii) to influence the policy of a government by intimidation or coercion; or (iii) to affect the conduct of a government by mass destruction, assassination, or kidnapping; and •
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