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President Nana Addo Dankwa Akuffo Addo
A common condition for soldiers that lived on the trenches was Shell Shock, a type of post-traumatic stress disorder (PTSD) received by soldiers due to the intensity of bombardment and fighting.
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Southerners enjoyed the initial advantage of morale: The South was fighting to maintain its way of life, whereas the North was fighting to maintain a union. Slavery did not become a moral cause of the Union effort until Lincoln announced the Emancipation Proclamation in 1863.
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According to a blog maintained by the History Department at Harvard University, Rome was a republic for 450 years until it became an empire under Julius Caesar.
The British Museum has determined that the fall of the Roman Empire took place by the fifth century AD
These two senteces above are used in the passage to show credibility.
This is because they make reference to two institutional authorities that have credibility and prestige in academic history, and the cultural world: the History Department at Harvard, and the British Museum.
In other words, the Harvard and the British Museum are the sources of the passage.
