Explain+the+Columbian+Exchange.

The Columbian Exchange (Princeton Review P.186-7 & 5 Steps to a 5 P. 151-2)
 * Initiated by Columbus' discovery of the western hemisphere
 * Traded new foods, animals, diseases, and technology
 * Increased European Dominance
 * The introduction of horses to the new world helped mobilize the native people
 * Europeans just wanted lane=power and money
 * Before this period the Western Hemisphere was mostly isolated
 * In general, Europeans had established ports in Asia, India, Africa, and the newly discovered Americas.