The basis of the u. s. economy has changed from 1) agriculture to manufacturing to service industries 2)agriculture to transportation to communication 3)agriculture to industry to communication 4) agriculture to industry back to agriculture

Compare demographic and environmental effects of the columbian

How did mercantilist policies european countries build wealth and power

Afarmer who is grown corn for the past five years notices in the sixth year that the his harvest is significantly smaller, despite an increase in labor on the farm. the following year, the harvest continue to decline. which of the following explanations most plausibly accounts for the reduction in corn yield? a) soil degradation b) desalinization c) better irrigationd) terracing