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During the period 600 BCE to 600 CE, the external factors that caused imperial decline and collapse were nomadic travelers and the spread of disease.  However, the class gap between grew and humans were beginning to overthrow the power, causing an unstable government.
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External Factors causing Imperial collapse

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External Factors causing Imperial collapse

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During the classical era from 600 BCE-600 CE the external (and internal) factors that caused the decline and eventual fall of several empires were constant invasions from pastoral nomads and the spread of diseases due to increased contact with the outside world and the increase of trade (Certain groups of people who may've been immune to certain diseases traveled to several empires and the disease spread across the empire since a majority of the people weren't immune to the disease). However, other internal factors like deforestation and the growing gap between the rich and poor also caused the collapse of several empires due to shortage of resources and environmental destriction thanks to deforestation and political instability and unrest thanks to a growing distance in the wealth gap. (Done)

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During the time period from 600 BCE to 600 CE the external factors that caused the imperial decline and collapse of empires were the invasion of pastoral nomads and the spread of disease due to trade. However there were many internal factors that lead to the decline and collapse of empires. Such as a growing class gap and political instability. Done

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During 600 BCE to 600 CE, the external factors that caused the imperial decline and collapse were pastoral nomads and spread of infections from trade. However, the increasing divide in classes also caused imperial decline and collapse. Done

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During the period circa 600 BCE to 600 CE, imperial decline and collapse were caused by external factors such as invasions by outside societies and the spread of foreign diseases through large trade routes . However, imperial decline and collapse were also greatly caused by internal problems such as revolts of poor/slave populations due to a large gap between the rich and poor in many empires. Done.

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During the Classical Age, the external factors that caused imperial decline and eventual collapse were the constant threat and invasion of pastoral nomadic peoples. The spread of disease through trade routes to empires. However when looking at factors that had large effects on imperial decline and collapse are also internal factors, one of these is over exploitation. Done.

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During the period 200 BCE to 600 CE, the main external factors that caused imperial decline and collapse were Invasion from other groups of peoples and pastoral nomads  and the influence of diseases. However, Some of the more significant factors of imperial decline and collapse were internal such as the growing gap between the wealth and the poor. Done

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During the period of time between 600 BCE to 600 CE, there were a couple external factors which caused the decline and eventual collapse of an empire. Those factors include the spread of disease, and the invasion of pastoral nomadic groups. However, internal factors were also crucial to imperial decline, like political instability or overreach. DONE.

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During the 600 BCE to 600 CE, the interaction with the environment causes were invasions of empires and spreading of diseases. However, there were also too big of gaps between the rich and the poor. Done

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During the time period circa 600 BCE to 600 CE, the external factors that caused imperial decline were invasions from nomadic people, and the spread of diseases due to increased trade. However, these external factors cannot take full responsibility for causing imperial decline. There were many internal factors such as a growing class gap causing rebellion, leading to political instability, and overreach with empires becoming too big to control effectively. done

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During the period circa 600 BCE to 600 CE, the external factors that caused imperial decline and collapse were the invasions of pastoral nomadic peoples and the spread of disease through trade. However,  internal factors, like overreach, lead to political instability and, ultimately the decline of the empire. Done

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During 600 BCE to 600 CE, the external factors that caused the imperial decline were invasions of pastoral nomads and disease. However their was internal factors like corruption in the emperor. Done

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During the period of 600 BCE to 600 CE the external factors that caused imperial decline and collapse were the increasing rate of disease and illness due to trade within regions, and the invasion of pastoral nomadic people. However, one internal factor that was significant class gap between the rich and the poor, creating a political disagreement. DONE

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The external factor that caused imperial decline and collapse was when they get invaded for others. Done

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During the period circa 600 BCE to 600 CE, diseases and other attacking civilizations caused imperial decline and collapse. However, invasions of pastoral nomadic groups probably caused much more damage, and was usually the last straw to fell a kingdom. Done

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During the period of 600 BCE to 600 CE, the external factors that caused the imperial decline and collapse were the invasion of Pastoral Nomadic groups and the spread of diseases.  However,  internal factors were more significant in the imperial collapse and decline.

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During the time period 600 BCE to 600 CE, the extent of external factors that caused imperial decline were caused by small invasions of pastoral nomads and the spread of diseases through trade. However, the overreach of empires led to the weakening of government leading to imperial decline. DONE.

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During the period 600 BCE to 600 CE, the external factors that caused imperial decline were the spread of disease and the the pastoral nomadic invasions. However these external factors were more significant because of the impact that the internal factors have added. Done

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During 600 BCE to 600 CE, the external factors that caused imperial decline were invasions done by pastoral nomads and the spread of disease through trade. However, these were not the only factors that caused imperial decline, there were internal factors such as political instability that played a big role as well. Done!

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During the time period 600 BCE to 600 CE the external factors that caused the imperial decline and collapse were the spread of infectious diseases from other areas of concentrated peoples due to trade and the invasion of pastoral nomads from the frontier of the empire, while the empire was already in a weakened state. However internal factors also led to the imperial decline and collapse like the growing gap between the rich landowners and the poor peasants which in turn caused political instability. DONE

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During the 600BCE to 600CE the external factors that caused imperial decline and collapse were invasions by pastoral nomadic people and the spread of disease. However internal causes like political instability from the growing gap of the rich and the poor weakened empires leading them down the path of collapse. DONE

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During the period 600 BCE to 600 CE, the external factors that caused imperial decline and collapse were pastoral nomadic invasions, and the spread of disease. However, there were internal factors as well, an unstable government due to a gap between the rich and poor social classes. Done