please delete this answer, i did not mean to answer this.
Invasions of people--many of the groups came as military and fought the Romans as invading forces.
Counterclaim--they were migration patterns as they were attempting to gain access to an empire with advanced trade and education. Migrating to the Roman Empire gave a person or group with extra resources.
The structure of the president's executive office was able to help the role of the office of the President because the office contains multiple and different levels of advisers and staff who are required to help the president in many areas.
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The time had no electricity and so it was an age that was quite dark. The era seemed less important than the Renaissance and the Roman Empire. Castles were very dark and did not let in much light.
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