Neutrality. American neutrality, comparative print of H. J. Res. 306, neutrality act of 1939, present neutrality law approved May 1, 1937, neutrality act of 1939 (H. J. Res. 306) as passed by House of Representatives, June 30, 1939, substitute neutrality act of 1939 (H. J. Res. 306) as passed by Senate, Oct. 27, 1939.