Did american have more diseases than europeans in the 1500s?

Why is it useful for historians to base certain studies on the analysis of historical themes

Which of the following is an example of the pull factor known as economic migration? a. better educational opportunities pulling people towards a new country b. mexican laborers entering the us to work in agricultural jobs c. joining family members that are already in a new country d. crop failures driving people away from their country i am unsure on this question, i was thinking b? but i could be wrong.

Uuttuvu v uutc . cuyumlu 6. which has most weakened guatemala's economy? art 1 foreign debt built up in the 1980s ns evidence of continuing rights violations more than three decades of civil war extremely high levels of poverty