Question

What did British preserve official documents

Answer 1

Hi,
The British preserved the important official documents because these served as records of what the officials thought, what they were interested in and what they wished for. According to the British, writing was more important than speaking as the documents in archives and museums can be utilized for reference at a much later period whenever required for studying or debating. These can also serve as an information or proof of any decision or action taken earlier on some matter. 
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Answer 2

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One important source is the official records of the British administration. The British believed that the act of writing was important. Every instruction, plan, policy decision, agreement, investigation had to be clearly written up. Once this was done, things could be properly studied and debated.