African slaves often used Christian hymns to communicate. The slaves used these hymns in order to communicate coded messages to each other about their conditions, and possible avenues for escape. The slaves' overseers thought that the slaves were simply singing religious songs and were not able to recognize the messages hidden within these songs. These hymns had an influence on the later musical style of the African American spiritual.
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Significance. The barbarian kingdoms marked the transition from Late Antiquity to the Early Middle Ages in the 6th and 7th centuries, gradually replacing the Roman system of government on the lands of the Western Roman Empire, notably in the two western prefectures of Gaul and Italy.
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Compass: Allowed sailors and navigators to find direction.
Gunpowder: Allowed us to make modern day weapons, such as guns.
Paper: Allowed us to write on a thing that can be mass produced and is efficient to use.
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