Here are a few suggested books on the conditions of pre-war Germany:

“Germany 1918-1939” by John Kerr

“Economic Crisis and French Foreign Policy” by Haim Shamir

“The Treaty of Versailles: a reassessment after 75 years” by Manfred Franz Boemeke, Gerald D. Feldman, Elisabeth Gläser

“The General Theory of Employment, Interest and Money” by John Maynard Keynes

“Wilsonianism: Woodrow Wilson and his legacy in American foreign relations” by Lloyd E. Ambrosius