The country that experienced the 1929 stock-market crash known as the Great Crash after the Dow Jones reached its September peak was the United States.
The New York Stock Exchange was the central marketplace involved, and the Dow Jones Industrial Average had reached a record closing level on September 3, 1929. After weeks of instability, heavy selling accelerated in October, producing Black Thursday, Black Monday, and Black Tuesday.
The crash spread internationally through trade, investment, and banking connections, but its defining events took place in the United States. The economic consequences included falling production, bank failures, unemployment, and a collapse in international trade. These problems contributed to the Great Depression, which affected countries around the world.
The 1929 event is sometimes described simply as the Wall Street Crash, while the broader worldwide economic crisis is called the Great Depression. Those terms are related but not identical: one names the market collapse, and the other names the prolonged economic downturn.