To what extent was columbus exchange good?

The primary positive effect of the Columbian exchange was the introduction of New World crops, such as potatoes and corn, to the Old World. The most significant negative effects were the transmission of African populations into slavery and the exchange of diseases between the Old and New World. Hope this helps you out!

the american revolution was by the middle and upper class, and the french was by the lower and middle class.

b. sec, foreign relations