War on terror has changed significantly since the attacks of 2001. Terrorism has always been a part of American life, with the assassination of President William McKinley in 1901 by Leon Czolgosz. More recently, however, the United States has contested with terrorism stemming from extreme Islamist groups that are at ideological odds with the Western way of life. The war on terror that began in 2001 has grown to represent billions of dollars and thousands of individuals whose mission it is to never allow another attack on U.S. soil again, if they can help it. The tools of the U.S. have grown, yet so have those of terrorist groups worldwide.

The war on terror began as an immediate strike into Afghanistan, and slowly grew into Iraq, and the world at large. More recently, it has been seen in places like Libya, Syria, Egypt, and Yemen. The war itself began as...
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