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The three invaders are the Huns, Visigoth, and the Vandals.
The correct answer is C. The closing of the western frontier.
In his 1893 published paper, The Significance of the Frontier in American History, Turner stated that while it was technically true that the frontier was closed, it was the frontier life that shaped the success of the United States. His idea, which was summarized in his frontier thesis, traced the development of the United States using the settlement of the West as a measure. He argued that early settlers were essentially Europeans; they had European values and European character, but because of the frontier experience, they had to adapt, resulting in their placing a greater value on things like ingenuity, democracy and individualism. Furthermore, it was these experiences of living out in the frontier that led to settlers becoming distrustful of authority, less artistic, and more violent.
Enrich fermi was a scientist and a physicist .He discovered nuclear fission and he led several tests releated to the use of nuclear power and his work was mostly on induced radioactivity by neutron bombardment and the discovery of transuranic elements or a nuclear reactor .His new find followed Marie Curies and Joliot’s discovery of artificial radioactivity .At age 14 he lost his brother from a minor throat surgery accident.In order to escape the pain of losing his brother ,Fermi buried himself in books about physics that fascinated him and soon got him into college with an entrance exam essay that was judged worthy of a doctorates degree .So you could say that his own loss of his brother motivated him to start making discoveries of his own in physics and on experimenting with neutrons. Hope this helped !
Answer: their population was mostly noblemen and indentured servants.
Explanation:
