How did the columbian exchange benefit the old world?

What combinations best explain the cause of world war 1? Who came from a southern slaveholding family but became an important abolitionist and moved to the north in support of abolitionist efforts and became a quaker? What is carbomer in toothpaste? A civilization whose impact can be felt on history for a very long time is called? Alfred the Great King of England he ruled the Anglo-Saxon province of what? Is it true that Strong nationalism often hindered negotiations between world leaders? What countries was apart of the triple entente until 1917? Why does the author include this description of the penny in beginning of the chapter to emphasize for the reader the difference between modern currency and the British currency of that time period? What did ancient egyptians drink? What is Serbias response to the ultimatum sent by the Austro-Hungarian empire? What does what in the world mean? Who did the Greeks fight against in the 5th century bce? What was the largest empire before rome? After world war ll what happened to the population in cities and suburbs? Who are all the ally countries in world war 2? What was the effect of the meeting of representatives from 50 countries in san francisco near the end of world war 1? Why did Henry kelsey come to Canada? What was the Great Purge characterized by? Which Prince Edward declined his throne and ran off with a American woman that had already gotten married before? How could a historian like Procopius give two such different accounts of the same person?