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The extent to which American adults are fluent in multiple languages is important not only for the nation’s ability to compete in a global marketplace but also for its capacity to develop and execute effective foreign policy. Data from the U.S. Census Bureau and analyzed by the Humanities Indicators indicate that the share of American adults who speak English and use another language at home has grown substantially over the last several decades, paralleling the substantial increase in the immigrant population over that time period.

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* Adults are defined as people age 18 or older.

Source: For 1980–2000: U.S. Census Bureau, Decennial Census. For 2010 and later: U.S. Census Bureau, American Community Survey (ACS) Public-Use Microdata Sample. Data analyzed and presented by the American Academy of Arts and Sciences’ Humanities Indicators (www.humanitiesindicators.org).

In January 2006, President George W. Bush launched the National Security Language Initiative, which was designed to “dramatically increase the number of Americans learning critical need foreign languages such as Arabic, Chinese [Mandarin], Russian, Hindi, Persian, and others through new and expanded programs from kindergarten through university and into the workforce.” (U.S. Department of State, “National Security Language Initiative,” Fact Sheet [January 5, 2006]). The other languages deemed “critical” as of January 2021 were Azerbaijani, Bangla, Indonesian, Japanese, Korean, Portuguese, Punjabi, Swahili, Turkish, and Urdu. For the number of U.S. adults who speak certain of these languages at home and also report speaking English well or very well, see the supplemental table.

Despite the concern about what is perceived as a national foreign-language deficit, however, existing data on multilingualism are of limited use in gauging the true extent of the country’s fluency in multiple languages. This is true for several reasons. First, such data are based on self-reported information—currently, no system objectively measures and registers individuals’ multilingual capabilities. Second, the national trend data covering the greatest length of time, those collected by the U.S. Census Bureau, reflect a concern with immigrants’ ability to acquire English-language skills. Thus these data do not capture those individuals who speak English at home and acquired proficiency in another language via formal education or contact with the non-English language in another nondomestic setting; nor do the data account for those who may have learned a language other than English in their childhood homes (and still speak it fluently) but who do not use that language in their own homes as adults. Moreover, Census Bureau data do not measure the extent of individuals’ proficiency in their non-English “home” language. Finally, data collected by the bureau and other organizations do not reveal what share of the population is fluent in multiple non-English languages.

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* Adults are defined as people age 18 or older. For a list of the languages included in each of the categories above, see the supplemental table.

Source: U.S. Census Bureau, 2021 American Community Survey Public-Use Microdata Sample. Data analyzed and presented by the American Academy of Arts and Sciences’ Humanities Indicators (www.humanitiesindicators.org).

In January 2006, President George W. Bush launched the National Security Language Initiative, which was designed to “dramatically increase the number of Americans learning critical need foreign languages such as Arabic, Chinese [Mandarin], Russian, Hindi, Persian, and others through new and expanded programs from kindergarten through university and into the workforce.” (U.S. Department of State, “National Security Language Initiative,” Fact Sheet [January 5, 2006]). The other languages deemed “critical” as of January 2021 were Azerbaijani, Bangla, Indonesian, Japanese, Korean, Portuguese, Punjabi, Swahili, Turkish, and Urdu. For the number of U.S. adults who speak certain of these languages at home and also report speaking English well or very well, see the supplemental table.

Despite the concern about what is perceived as a national foreign-language deficit, however, existing data on multilingualism are of limited use in gauging the true extent of the country’s fluency in multiple languages. This is true for several reasons. First, such data are based on self-reported information—currently, no system objectively measures and registers individuals’ multilingual capabilities. Second, the national trend data covering the greatest length of time, those collected by the U.S. Census Bureau, reflect a concern with immigrants’ ability to acquire English-language skills. Thus these data do not capture those individuals who speak English at home and acquired proficiency in another language via formal education or contact with the non-English language in another nondomestic setting; nor do the data account for those who may have learned a language other than English in their childhood homes (and still speak it fluently) but who do not use that language in their own homes as adults. Moreover, Census Bureau data do not measure the extent of individuals’ proficiency in their non-English “home” language. Finally, data collected by the bureau and other organizations do not reveal what share of the population is fluent in multiple non-English languages.

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