What does the Treaty of Copenhagen, reparations, and World War II have to do with the United States?

Climate Treaty Reparations would cost $50-$200bn per year

The largest share of the burden would be borne by the United States. Students of history may remember that the reparations forced upon Germany by the victors of World War I, resulted in hyperinflation, destroyed the German middle class, and eventually brought Adolf Hitler to power, causing World War II.