Each year, under the terms of the Visa Waiver Program, more than 10 million citizens from 27 countries -- mostly in Europe -- enter the U.S. for 90 days or less without being required to go through the screening process of first obtaining a visa. Although it offers great economic benefits for the U.S., critics argue that terrorists who carry passports from these countries can easily gain entry to the U.S. and that the security risks outweigh the benefits of the program. Here are the pros and cons.
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