In 1917, Germany attacked some passengers in submarines from the US that led the US to assist in WW1. Hope this helps!
Germany invaded Poland on September 1st 1939
<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be that there was a sharp decline in manufacturing, since more jobs in these sector were being "exported" overseas.</span></span>