Question

how did the british preserve the reports and documents ?

Answer 1

british believed that written document would help them for their administrative works. they preserve their documents and reports in archive

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.