This type of ignorance isn't bliss.

Americans have a tendency to overstate the number of Muslims living in the United States -- and at least 13 other countries are dealing with the same misconception.

Only 1% of America's more than 319 million residents are Muslim, according to the research group Ipsos MORI. But during a recent global survey, Americans told researchers that the Muslim population is 15 times greater than it really is.

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