History › World wars & Cold War › World War II
Great Depression
October 1929 crash – late 1930s· Event· Global
Well documentedSolid records, physical evidence or scientific consensus.
The worst economic slump of the industrial era, beginning with the 1929 Wall Street crash and lasting through most of the 1930s.
See it on the History map →What happened
After the October 1929 stock crash, thousands of US banks failed, wiping out savings, and money and credit shrank. Tariffs such as the 1930 Smoot-Hawley Act and the gold standard spread the slump abroad. By 1933 US output had fallen about a quarter and unemployment hit roughly 25 percent; Germany's peaked near 30 percent. World trade shrank by about two-thirds in value. Recovery came as countries left gold and spent heavily, through Roosevelt's New Deal and then rearmament.
Why it matters
It discredited free-market orthodoxy and democracy in many eyes, helped bring Hitler to power, and produced modern tools like deposit insurance, Social Security and government spending to fight recessions.
Think of it like
Like a vacancy spiral in a downturn: lost tenants mean missed loan payments, lenders pull credit, more businesses fold, and vacancies rise again.
How we know
Government statistics on output, prices and unemployment, bank failure records, and economic studies such as Friedman and Schwartz's (1963) and Ben Bernanke's on bank failures.
Still debated
Economists still debate the main cause: central-bank mistakes, the gold standard, the bank panics, or a collapse in spending.
Connections (3)
▸Great Depression fueled Fascism and Nazi Germany (Mussolini, Hitler)Mostly agreed
The connection
The Depression turned the Nazis from a fringe party into Germany's largest. Their vote rose from 2.6 percent in 1928 to 37 percent in July 1932, as unemployment reached about 6 million. Desperate voters abandoned the democratic parties, and both Communists and Nazis gained. Mussolini was already in power, but the slump boosted fascist movements across Europe.
When and how
Germany's Weimar Republic, 1929–1933; President Hindenburg appointed Hitler chancellor on January 30, 1933, after a backroom deal with conservative elites.
How sure are we?
Election results and unemployment figures rose together, and voting studies link Nazi gains to economic distress, though not simply to unemployment.
Debates and open questions
Who exactly voted Nazi is still studied: the jobless often voted Communist, while the self-employed, farmers and the Protestant middle classes swung to Hitler.
▸Great Depression helped cause World War IIMostly agreed
The connection
The Depression broke the 1920s world order. Countries raised tariffs and formed trade blocs, undercutting cooperation. Japan, hit hard by collapsing silk exports, turned to military expansion and seized Manchuria in 1931. In Germany the slump brought Hitler to power. Rearmament then became a way out of unemployment, speeding the march to war.
When and how
Worldwide, 1929–1939; key steps include Japan's seizure of Manchuria (1931), Hitler's appointment (1933) and Italy's invasion of Ethiopia (1935).
How sure are we?
Trade, unemployment and political data, and leaders' own statements tying expansion to economic needs, such as Japan's case for Manchuria's resources.
Debates and open questions
Historians debate how far economics, versus ideology and particular leaders' choices, explains the war; other hard-hit democracies did not turn aggressive.
▸2008 global financial crisis was the worst crash since the Great DepressionWell documented
The connection
Measured by lost output, bank failures and global reach, 2008 was the worst crisis since the 1930s, hence the name 'Great Recession'. Policymakers used the Depression's lessons on purpose: Fed chair Ben Bernanke, a Depression scholar, flooded markets with money, and governments spent heavily to avoid repeating 1930s mistakes.
When and how
2007–2009, centered in the US and Europe. US output fell about 4%, against about 26% in 1929–33.
How we know
Economic data rank 2008 as the deepest downturn since the 1930s; Bernanke's research and memoir describe applying Depression lessons.
Debates and open questions
Whether the forceful response prevented a second Depression, or fed later problems like asset bubbles and inequality, is debated.