Birth and population control
16 objects illustrate this topic:

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"Approximate fecundity indices of American women by nativity for the decade 1910-1920," about immigration (#934)
"A Practicable Eugenic Suggestion," by W. McDougal about incentives for positive eugenics (#2091)
"Birth Control and the Racial Future," by Frank H. Hankins, People (April 1931), multiple pages (#1598)
"Birth Control Peril to Race, Says Osborn," New York Times (8/23/1932), review of H.F. Osborn's paper at Third International Eugenics Congress, multiple pages (#1808)
"Birth Control Steps Out, A Note on the Senate Hearing," by Margaret Sanger, People (April 1931), multiple pages (#1606)
"Eugenical Remarks on China," by A.B. Droogleever Fortuyn, Eugenical News (vol. 15:6), multiple pages (#1891)
"Feminist Aims All Nonsense, Says Eugenicist," New York Herald Tribune (8/23/1932), review of Third Eugenics Congress including immigration policy (#1806)
"Is our national intelligence declining? The genetic point of view." L.S. Penrose, multiple pages (#2236)
Margaret Sanger testisfies on birth control before Senate committee, People (April 1931) (#1616)
"Mathematical Darwinism, A Discussion of the Genetical Theory of Natural Selection," by J.B.S. Haldane, Eugenics Review (vol 23:1), multiple pages (#1820)
"On Catholicism, As Revealed in the latest Encyclical of His Holiness Pope Pius XI," Eugenics Review (vol 23:1), papal decree condemning eugenics, multiple pages (#1814)