The major issue dividing the North and South in the 1800s was slavery. the North thought slaves should be free and have the same rights as everyone else, but the South thought the complete opposite.
Newton's Law of Universal Gravitation, also called Newton's Law of Gravity.
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Anglo zanabar war
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France clamied vietnam as a colony after world war 2
One of the main reasons why the invasion of the Byzantine empire by the Turks was significant was because that when the Turks first invaded the Byzantine Empire, the Holy Lands in the empire itself were taken over, which caused the Pope to supply troops for the Crusades.