How did invading forces contribute to the fall of the byzatine empire

Invading forces contribute to the fall of the Byzantine empire by weakening the empire. ... The Byzantines created another barbarian group, called the Avars, to stop the Slavs. As the two groups were at war with each other, they were physically weakening the empire's structure.

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to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.