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The 1816 Year without a Summer was one of the most devastating European winters ever, worst famine in the 19th century, and caused a mass agricultural disaster.
The areas with the biggest temperature drops were at the center of Napoleon's First French Empire. However, in terms of famine, Britain and Germany were more damaged due to being colder in the first place. Wide starvation caused riots, arson, and looting in many cities throughout Europe.
What would have happened if the 1816 Year without a Summer occurred in a surviving Napoleonic Empire?
Consider two scenarios: a declining France fighting off the last of the Coalition. And alternatively, a stable, ascendant France still dominating Western Europe. (If you'd like, you can also consider an 1816 instead of 1812 invasion of Russia.) How would the effects differ?