<span>the deliberate killing of a large group of people, especially those of a particular ethnic group or nation.</span>
Nadir means the lowest point that can be reached. Here it is understood as the lowest point of life that the people have reached according to their rights. It comes from astronomy and is used to describe the point that is directly below the observer, but it is used figuratively as a low point.
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The flag was adopted in 1842.