People flocked to the cities in the late 1800's because during this time factories were booming and there was more opportunity in the cities. Therefore the answer is B.
If your talking about the trans-Saharan trade, the answer is that the trans-Saharan trade route transformed West Africa by connecting it to the larger parts of the world. This trade route in particular was intriguing as it required the need for human adaptation and innovation over this vast desert area.
Answer:
The change in breastplates and helmets contribute to decline of the Roman Empire by weakening the the military. It weaken them because the removal of it promote laziness and negligence of training and the such. It also removes the protection against ranged weapons which caused many casualties.
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