Why did the relationship between chinese and nomads grow tense?

The nomads caused invasions that weakened the Zhou dynasty, leading to a violent and tense relationship between the Chinese and nomads.

Invasions lead by the nomads and intrusion within a country would obviously lead to tense relationships if any at all, causing the Zhou dynasty to attempt to block and fight the nomads back, thus the violent relationship.

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d) in the state of iowa

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.