Because he proved that the earth wasn't at at centre of the solar system like everyone thought it did. It also showed the sun doesn't move, it's the earth moving around it.
Anthropologists most typically find employments in academic settings.
However, it's important to note that anthorpologists are increasingly finding jobs in different fields that are not academic as well. There is a projected surge in the emplyoment of people who have majored in anthropology in the following decade.
Another thing to point out is that this answer may depend on your country as well as time frame you're asking about.
Answer: With five simple words in the Declaration of Independence—“all men are created equal”—Thomas Jefferson undid Aristotle’s ancient formula, which had governed human until 1776: “From the hour of their birth, some men are marked out for subjection, others for rule.” In his original draft of the Declaration, in soaring, fiery prose, Jefferson denounced the slave trade as an “execrable commerce ...this assemblage of horrors,” a “cruel war against human nature itself, violating its most sacred rights of life & liberties.” As historian John Chester Miller put it, “The inclusion of Jefferson’s strictures on slavery and the slave trade would have committed the United States to the abolition of slavery.”
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They let the states choose the major political parties' nominees for the general election.
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