The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU01373396
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Civilian Labor Force Participation Rate: Men, Foreign Born [LNU01373396], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU01373396/, August 4, 2015.