Section, Aug. 14, 1935, ch. 531, title IV, § 414, as added Pub. L. 104–193, title I, § 103(a)(1), Aug. 22, 1996, 110 Stat. 2156; amended Pub. L. 105–33, title V, § 5514(c), Aug. 5, 1997, 111 Stat. 620; Pub. L. 108–40, § 3(i), June 30, 2003, 117 Stat. 837; Pub. L. 112–96, title IV, § 4002(f), Feb. 22, 2012, 126 Stat. 195, related to a study by the Census Bureau.

A prior section 614, act Aug. 14, 1935, ch. 531, title IV, § 414, as added Aug. 13, 1981, Pub. L. 97–35, title XXIII, § 2308, 95 Stat. 848; amended July 18, 1984, Pub. L. 98–369, div. B, title VI, §§ 2638(a), 2663(c)(7)(A), 98 Stat. 1143, 1166, related to work supplementation program, prior to repeal by Pub. L. 100–485, title II, §§ 202(b)(13), 204(a), (b)(1)(A), Oct. 13, 1988, 102 Stat. 2378, 2381, effective Oct. 1, 1990, with provision for earlier effective dates in case of States making certain changes in their State plans and formally notifying the Secretary of Health and Human Services of their desire to become subject to the amendments by title II of Pub. L. 100–485, at such earlier effective dates.