The cause & effect relationship shows the actions or events in which at least one action or event is a direct result of the others.
A cause means something that contributes to the occurence of an event or the rise of an idea while an effect means what happens as a consequence an event, idea, development etc.
Therefore, as the cause & effect relationship shows the actions that is a direct result of the others, then, it helps to explain the relationship associated with the historical developments in documents 1 and 2.
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