Autos are all passenger cars, including station wagons. Domestic sales are all United States (U.S.) sales of vehicles assembled in the U.S., Canada, and Mexico.
Source: US. Bureau of Economic Analysis
US. Bureau of Economic Analysis, Motor Vehicle Retail Sales: Domestic Autos [DAUTOSA], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/DAUTOSA/, July 3, 2015.