The "Other regions" category includes Africa and Oceania.
2) In 2000, in contrast to 1990, nonresponse on country or region of birth was allocated. For 2000, the "Not reported" category only includes those born at sea.
Source: The 2000 data are from US Census Bureau, Census 2000. Data for all other years are from Gibson, Campbell and Emily Lennon, US Census Bureau, Working Paper No. 29, Historical Census Statistics on the Foreign-Born Population of the United States: 1850 to 1990, US Government Printing Office, Washington, DC, 1999. This report is available online.