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Data Dictionary: ACS 2021 (5-Year Estimates)
you are here: choose a survey survey data set table variable details
Data Source: Social Explorer; U.S. Census Bureau
Universe: Total population
Variable Details
A05001. Ancestry
Universe: Total population
A05001_001Total:
Percent base:
None - percentages not computed (variable is table universe)
Aggregation method:
Addition
Formula used to compute this variable:
Return_Value = ACS21_5yr:B04007001; if (ACS21_5yr:B04007001.IsNull) Return_Value.IsNull = true
Variables used in the formula:
ACS21_5yr:B04007001
Total
Relevant Documentation:
Excerpt from: Social Explorer; U.S. Census Bureau; 2021 ACS 1-year and 2017-2021 ACS 5-year Data Releases : Technical Documentation.
  2021 ACS 1-year and 2017-2021 ACS 5-year Data Releases: Technical Documentation -> Subject Definitions -> Population Variables -> Place of Birth -> Nativity
Nativity
Information on place of birth and citizenship status was used to classify the population into two major categories: native and foreign born.

Excerpt from: Social Explorer; U.S. Census Bureau; 2021 ACS 1-year and 2017-2021 ACS 5-year Data Releases : Technical Documentation.
  2021 ACS 1-year and 2017-2021 ACS 5-year Data Releases: Technical Documentation -> Subject Definitions -> Population Variables -> Citizenship Status (U.S. Citizenship Status)
Citizenship Status (U.S. Citizenship Status)
The data on citizenship status were derived from answers to Question 8 in the 2021 American Community Survey (ACS). This question was asked about Persons 1 through 5 in the ACS.

Respondents were asked to select one of five categories:

(1) born in the United States,

(2) born in Puerto Rico, Guam, the U.S. Virgin Islands, or Northern Marianas,

(3) born abroad of U.S. citizen parent or parents,

(4) U.S. citizen by naturalization, or

(5) not a U.S citizen. Respondents indicating they are a U.S. citizen by naturalization are also asked to print their year of naturalization.

People born in American Samoa, although not explicitly listed, are included in the second response category.

For the Puerto Rico Community Survey, respondents were asked to select one of five categories: (1) born in Puerto Rico, (2) born in a U.S. state, District of Columbia, Guam, the U.S. Virgin Islands, or Northern Marianas, (3) born abroad of U.S. citizen parent or parents, (4) U.S. citizen by naturalization, or (5) not a U.S. citizen. Respondents indicating they are a U.S. citizen by naturalization are also asked to print their year of naturalization. People born in American Samoa, although not explicitly listed, are included in the second response category.


When no information on citizenship status was reported for a person, information for other household members, if available, was used to assign a citizenship status to the respondent. All cases of nonresponse that were not assigned a citizenship status based on information from other household members were allocated the citizenship status of another person with similar characteristics who provided complete information. In cases of conflicting responses, place of birth information is used to edit citizenship status. For example, if a respondent states he or she was born in Puerto Rico but was not a U.S. citizen, the edits use the response to the place of birth question to change the respondent's status to "U.S. citizen at birth."

U.S. Citizen
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Respondents who indicated that they were born in the United States, Puerto Rico, a U.S. Island Area (such as Guam), or abroad of American (U.S. citizen) parent or parents are considered U.S. citizens at birth. Foreign-born people who indicated that they were U.S. citizens through naturalization also are considered U.S. citizens.

Not a U.S. Citizen
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Respondents who indicated that they were not U.S. citizens at the time of the survey.

Native
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The native population includes anyone who was a U.S. citizen or a U.S. national at birth. This includes respondents who indicated they were born in the United States, Puerto Rico, a U.S. Island Area (such as Guam), or abroad of American (U.S. citizen) parent or parents.

Foreign born
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The foreign-born population includes anyone who was not a U.S. citizen or a U.S. national at birth. This includes respondents who indicated they were a U.S. citizen by naturalization or not a U.S. citizen.

The American Community Survey questionnaires do not ask about immigration status. The population surveyed includes all people who indicated that the United States was their usual place of residence on the survey date. The foreign-born population includes naturalized U.S. citizens, lawful permanent residents (i.e. immigrants), temporary migrants (e.g., foreign students), humanitarian migrants (e.g., refugees), and unauthorized migrants (i.e. people illegally present in the United States).

The responses to this question are used to determine the U.S. citizen and non-U.S. citizen populations as well as to determine the native and foreign-born populations.

Question/Concept History

In the 1996-1998 American Community Survey, the third response category was "Yes, born abroad of American parent(s)." However, since 1999 in
the American Community Survey and since the 2005 Puerto Rico Community Survey, the response category was "Yes, born abroad of American parent or parents." In 2008, respondents who indicated that they were a U.S. citizen by naturalization were also asked to print their year of naturalization. Also in 2008, modifications in wording were made to both the third response category (changed from "Yes, born abroad of American parent or parents" to "Yes, born abroad of U.S. citizen parent or parents") and the fifth response category (changed from "No, not a citizen of the United States" to "No, not a U.S. citizen").

Limitation of the Data

Beginning in 2006, the population in group quarters (GQ) is included in the ACS. Some types of GQ populations may have citizenship status distributions that are different from the household population. The inclusion of the GQ population could therefore have a noticeable impact on the citizenship status distribution. This is particularly true for areas with substantial GQ populations.

Comparability

Citizenship can be compared both across ACS years and to Census 2000 data. For more information, go to http://www.census.gov and enter "Comparing ACS Data" in the search box.