He dust bowl that occurred in america in the 1930s is a dramatic example of erosion caused by a. deforestation b. overgrazing c. climate change d. agricultural cultivation

The answer is D- agricultural cultivation

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