The Wall Street crash of 1929 was a watershed moment. It not only plunged millions of workers into poverty but had a dramatic economic and political impact on world capitalism. In its wake, major economies embraced protectionism and state intervention and turned away from the "free" market. This laid the basis for a renewed intensification of international and domestic political tensions on everything from the remilitarisation of Europe to the expansion of Japanese imperialism into China and the crisis of the Weimar Republic in Germany. This session will unpack both the reasons why the Great Depression broke out and how it reshaped world capitalism for years to come.