A. Violent attacks form the Eastern tribes even led to the downfall of Rome, as soon as the mongols got to Rome they had no challenge in defeating such a weak nation in it's decline.
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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A. The Social Contract
Thomas Hobbes is known for his social contract theory. It explains that people within a government have obligations to fulfill for the country. The government, on the other hand, have to grant the rights of the people. Two are bound to each with a social contract, an agreement. However, if the government neglects its duties to the people, they have the right not to follow or replace those that are in the leadership.
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Answer:
concrete
The most notable building technique introduced by the Romans was the use of concrete.
Explanation: