Answer
A: post WWI: treaty of Versailles forced Germany to pay reparations to France, GB, etc. Great Depression put Germany into deeper debt, food and work shortages. Setting the stage for a Hitler type to take power, use government investments to restore hopes of the masses.
B. Aggressions: Hitler was “secretly” rebuilding the German military might beyond treaty allowances; manpower, naval, air etc.
He bullied the European democracies to allow annexation of Austria, rearmament of the Sudentland once returned due to expiration of WWI treaty land concessions. Internal aggression towards Jews, opposition politicians rallied Nationalism amongst a majority of German populace.
C: Appeasement: England, France were so war weary; lingering from WWI... PM of Britain: Neville Chamberlain signed off on a treaty hoping Hitler would stand down with what he had gotten away with so far. This emboldened Hitler at a time when Germany was not ready for all out war. Had he been met with a threat of force “Line in the sand”, he may well have been forced to curb his ambitions of conquest.
Allies have since learned “peace through strength” is unfortunately the only way to negotiate with dictators.
Step-by-step explanation: