Which statement explains why the neutrality acts changed between 1935 and 1939?
1 between 1935 and 1939, the u. s. sales of war materials decreased.
2 between 1935 and 1939, war broke out in europe and asia.
3 between 1935 and 1939, u. s. foreign policy became more isolationist.
4 between 1935 and 1939, the united states joined the allied powers.