Question

What did the historians do to preserve there officials document and letters.

Answer 1

They create copies and store them in libraries to prevent them.

Answer 2

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British had preserved official documents, because they thought if they write and record everything, it will later be easier for them to study them and debate. They kept official records of what they thought was right, so that in the future, those records can serve as proofs of all the decisions that they had taken.