One historical difference between Richards and Nunn and Qian's interpretation of the Columbian exchange was that Richards was said to have been examining the exchange from the viewpoint of Native Americans who were said to have taken advantage of and also were killed by diseases such as influenza and smallpox, while that of Nunn and Qian was that they were said to be looking at the exchange as means of an advancement for the Old World that could be useful to the new world lands for the work of modernization and advancements in the areas of technology.
The historical event that could aid Richards' interpretation was the hard systems and oppressions of the Natives that were said to be faced by as a result of Spanish domination and an example is the caste system.
Note that this was one that has dictated some issues such as how much tax and labor was said to be owed to the Spanish due to the origin of nationality of the indigenous people.
One historical event that aid support Nunn and Qian's interpretation is the Company that is said to have used capitalism and forced labor to get profits in the new world using slave production.
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