World War I reparations
Economic problems from the payments were said to be an important factor that led to the end of the Weimar Republic and the beginning of dictatorship of Adolf Hitler.  John Maynard Keynes, a British economist, said this would weaken German economy as well as German politics.  However, many historians disagreed.  Margaret MacMillan, a Canadian historian, showed her idea that Germany could have paid all the payments if they wanted to.  She said that the problem was Germany would not like to pay.