Manifest Destiny was the idea that the people of America had a mission from God to conquer the continent form East to West. In all reality, it was a word used to rationalize the American peoples hunger for land and the westward expansion. They also used this term to rationalize the 'westernization' of the indigenous Indians they discovered as they traveled. <span />
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>
In beliefs there gods or goddess were telling them to do this and that