Year 1929 (MCMXXIX) was a common year starting on Tuesday in the Gregorian calendar. By January 1 of this year, every state in the entire world had adopted the Gregorian calendar, having abandoned the Julian calendar.
This year marked the end of a period known in American history as the Roaring Twenties after the Wall Street Crash of 1929 ushered in a worldwide Great Depression. In the Americas, an agreement was brokered to end the Cristero War, a counter-revolution in Mexico. The Judicial Committee of the Privy Council, a British high court, ruled that Canadian women are persons in the Edwards v. Canada (Attorney General) case. The 1st Academy Awards for film were held in Los Angeles, while the Museum of Modern Art opened in New York City. The Peruvian Air Force was created.
In Asia, the Republic of China and the Soviet Union engaged in a minor conflict after the Chinese seized full control of the Manchurian Chinese Eastern Railway, which ended with a resumption of joint administration. In the Soviet Union, General Secretary Joseph Stalin expelled Leon Trotsky and adopted a policy of collectivization. The Grand Trunk Express began service in India. In the Middle East, rioting occurred between Muslims and Jews in Jerusalem over access to the Western Wall. Mohammed Nadir Shah became King of Afghanistan. Britain, Australia and New Zealand began a joint Antarctic Research Expedition. The centenary of Western Australia was celebrated.