这句话如何理解By the time American colonists took up arms against G

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这句话如何理解
By the time American colonists took up arms against Great Britain in order to secure their independence,the institution of black slavery was deeply entrenched.
我理解为美国殖民者拿起武器反抗英国-A的时候黑奴制度-B确立起来了（是两个同时发生的事件）
但答案告诉我应该理解为A发生的时候B已经根深蒂固了，如果是这个意思的话后半句话应该用完成时吧？
比较混乱，

其实没有你想象的那么混乱吧,不一定要用完成时来体现已经根深蒂固的状态的啊,你看看by就好了,有了这个词语,不是都清楚了啊,就是啊,在其进攻反抗的时候,那个已经是成立了的了,希望你能理解咯,
不过没事,不明白,我们再说说啊..没事的

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