Bureau Of Census Figures Exclude Armed Forces Outside The Continental United States At Least For The Period 1940-1944. King'S Figures For 1917-1919 Evidently Include Armed Forces Outside The United States Based On Comparison With Census Figures. Source: For 1900-1908 Data: Wilford Isbell King'S Worksheet; For 1909 Data: King, The National Income And Its Purchasing Power (NBER), 1930, P. 47; For 1910-1944: Bureau Of The Census, Statistical Abstract Of The United States, 1944-1945, P. 8.
This NBER data series a08180 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: a08180
Release: NBER Macrohistory Database
National Bureau of Economic Research, Total Population for United States [A08180USA173NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A08180USA173NNBR/, November 30, 2015.