What were the main causes to the dust bowl

During the invasion of the soviet union, the einsatzgruppen did which of the following? killed large numbers of jews, as well as many locals. led military troops. eliminated local administration in lithuania. took over many administrative functions in the war effort. planned and organized extermination camps.

Why is it useful for historians to base certain studies on the analysis of historical periods

Which economic sector employs the least number of people in mexico, barbados, and venezuela? a. agriculture b. services c. industry