Name one positive impact of the Columbian Exchange and one negative impact

A positive effect of the Columbian exchange was the introduction of New World crops, such as potatoes and corn, to the Old World. A significant negative effect was the enslavement of African populations and the exchange of diseases between the Old and New Worlds.

Explanation:

A positive effect of the Columbian exchange was the introduction of New World crops, such as potatoes and corn, to the Old World

Explanation:

A significant negative effect was the enslavement of African populations and the exchange of diseases between the Old and New Worlds.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.