I believe the answer you're looking for is "The columbian exchange." Hope this helps.
He was the first American President in attending a Peace Conference, and not only he attended but he was one of the major powers who actively participated in it by proposing peaceful negotiations to a long-lasting peace in Europe, that included not to punish Germany harshly.
Answer:Aztecs
By the early 1500s the Aztecs had conquered most of Mesoamerica and had imposed their rule on an estimated 11–12 million people.
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Answer:
Frederick Jackson Turner argued that overseas expansion was a "safety valve" to keep ambitious Americans content.
