It affected them immeasurably because it enabled them to trade this surplus of food for things that they might need from other countries and thus get other pieces of technology or knowledge or anything similar. They could improve their state that way and that's how development of civilizations began.
True, but it depends on who you ask.
I think the answer is <span>declining crop prices due to overproduction. During the pre-war era, the US had been the number one food supplier of the European countries. Because of this demand, many land owners had expanded their lands and over produced their crops in order to cater the growing demand. However, when the war finished, countries have started planting in their own soils instead of relying import from the US, thus led to the Great Depression in the US.</span>
