They didn't, they used gas which was against international law.
Answer: Concert of Europe, in the post-Napoleonic era, the vague consensus among the European monarchies favouring preservation of the territorial and political status quo. The term assumed the responsibility and right of the great powers to intervene and impose their collective will on states threatened by internal rebellion.
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To me it seems like a DICTATOR.
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okay my question this for u.s history
What factors led to the end of Reconstruction?
please help me if you know thank you