The last factor is the greedy treaty made by the British. Once the Chinese had lost the war, they had no choice but to sign a treaty written by the British. Many unreasonable discissions were made in favour of the British including many unjust payments. China was completely demoralised and Britain was in the wrong for making them sign such an unfair treaty. They took advantage of China when they shouldn't have.
To conclude this argument, neither China nor Britain was completely wrong or right with all their decisions. They both contributed to the war and therefore it was both their fault. China's refusal for trade was wrong because they were being selfish and stubborn and they weren't considering the welfare of others. Britain was wrong in introducing opium because nothing can justify the trading of opium and it shouldn't have even been an option to trade it. Britain was also in the wrong by creating a treaty in their favour because China was in a weak position.
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