The purpose of the Lewis and Clark expedition in 1804-1806 was the first American expedition to explore the west, and map the newly acquired territory. They also wanted to find a practical route, and establish themselves. Studying the wildlife - plants, animals, etc - and establish trade with local indians was also an objective of the expedition!
The reason they went to war is when the Athens interfered in Persian affairs.
It sent their economies into further decline--European countries had invested in our stock market and they relied on our financial assistance following the war.
Germany was relying on circular loans from the US which provided funds to help them pay for reparations. After the stock market crash, we were no longer able to aid which stopped money from flowing into Europe. This caused further decline in Europe preventing them from investing in their own countries let along buy goods from the US.
It might be D, since that ties with agricultural
