For historians, the thirties are arguably the most difficult decade of the twentieth century to capture. Crisis and consolidation coexisted. The talk will illustrate this general impression with respect to the international mathematical community and the development of mathematics.
A broad variety of events will be discussed, such as the beginning of the IAS in Princeton, two brilliant ICMs (1932 in Zurich and 1936 in Oslo), a memorable conference in Moscow; the axiomatization of probability, the beginning of Bourbaki, the rewriting of Algebraic Geometry; politically motivated migrations, the fate of international mathematical review journals, etc. etc.
Many of these events have left their mark on mathematics as we know it today.