Answer:
columbian exchange
Explanation:
The Columbian exchange, also known as the Columbian interchange, named for Christopher Columbus, was the widespread transfer of plants, animals, culture, human populations, technology, diseases, and ideas between the Americas, West Africa, and the Old World in the 15th and 16th centuries.
It is D providing thesis that it is supported with reliable evidence
Fear of foreigners. The exact definition is an intense or irrational dislike or fear of people from other countries
It prevented the federal government's choice to stop making treaties and allowed it to continue passing the laws to carry out its Native American policies