A lack of resources, and the Pacific Ocean, prevented Japan from attacking the continental United States.
By throwing rubbish on them
As evidenced by the new Department of Homeland Security and the Patriot Act, Americans seemed willing to reduce the strictest interpretations of civil rights in order to allow authorities to prevent terrorist attacks.
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A dog whistle may help prevent a dog from attacking by distracting or calming the dog, but its effectiveness can vary depending on the individual dog and the situation. It is not a guaranteed method to prevent an attack.
A GREAT WHITES MOUTH ITS JAWS EXTEND OUT OF ITS MOUTH WHEN ATTACKING, THIS IS TO PREVENT ITS LIPS FROM GETTING CUT
staying out of the water.
Any antivirus program can do that.
electric fence
The Department of Homeland Security.
ways to prevent african americans from voting.
Don't let your dog see your parakeet!
www.intermute.com