The 1930s (pronounced "nineteen-thirties" and commonly abbreviated as "the '30s" or "the Thirties") was a decade that began on January 1, 1930, and ended on December 31, 1939. In the United States, the Dust Bowl led to the nickname the "Dirty Thirties". The decade was defined by a global economic and political crisis that culminated in the Second World War. It saw the collapse of the international financial system, beginning with the Wall Street Crash of 1929, the largest stock market crash in American history. The subsequent economic downfall, called the Great Depression, had traumatic social effects worldwide, leading to widespread poverty and unemployment, especially in the economic superpower of the United States and in Germany, which was already struggling with the payment of reparations for the First World War. The Dust Bowl in the United States (which led to the nickname the "Dirty Thirties") exacerbated the scarcity of wealth. U.S. President Franklin D. Roosevelt, elected in 1933, introduced a program of broad-scale social reforms and stimulus plans called the New Deal in response to the crisis. The Soviet's second five-year plan gave heavy industry top priority, putting the Soviet Union not far behind Germany as one of the major steel-producing countries of the world, while also improving communications. First-wave feminism made advances, with women gaining the right to vote in South Africa (1930, whites only), Brazil (1933), and Cuba (1933). Following the rise of Adolf Hitler and the emergence of the NSDAP as the country's sole legal party in 1933, Germany imposed a series of laws which discriminated against Jews and other ethnic minorities. Germany adopted an aggressive foreign policy, remilitarizing the Rhineland (1936), annexing Austria (1938) and the Sudetenland (1938), before invading Poland (1939) and starting World War II near the end of the decade. Italy likewise continued its already aggressive foreign policy, defeating the Libyan resistance (1932) before invading Ethiopia (1936) and then Albania (1939). Both Germany and Italy became involved in the Spanish Civil War, supporting the eventually victorious Nationalists led by Francisco Franco against the Republicans, who were in turn supported by the Soviet Union. The Chinese Civil War was halted due to the need to confront Japanese imperial ambitions, with the Kuomintang and the Chinese Communist Party forming a Second United Front to fight Japan in the Second Sino-Japanese War. Lesser conflicts included interstate wars such as the Colombia–Peru War (1932–1933), the Chaco War