Was the decline in international trade a cause or effect in the Great Depression

The Great Depression and international trade are deeply linked, with the decline in the stock markets affecting consumption and production in various countries. This slowed international trade, which in turn exacerbated the depression.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers