Final answer:
The event from 1929 that did NOT occur was the inauguration of Franklin Roosevelt; he was inaugurated in 1933. The stock market crash, St. Valentine's Day Massacre, and the enactment of the Kellogg-Briand Pact all occurred in 1929.
Step-by-step explanation:
All of the following events happened in 1929 EXCEPT for Franklin Roosevelt being inaugurated. In 1929, the Stock Market crashed, notably on October 29, known as 'Black Tuesday', marking the beginning of the Great Depression. The St. Valentine's Day Massacre also occurred in this year, as did the coming into force of the Kellogg-Briand Pact, an international agreement aiming to prevent war. However, Franklin Roosevelt was not inaugurated as President of the United States until 1933, following the presidential election of 1932.
The stock market crash of 1929 did not happen in a vacuum; it was influenced by a variety of factors, including international economic issues, poor income distribution, speculation, and shaky banking systems. While the crash was a tipping point, it alone did not cause the Great Depression but it certainly exposed the underlying economic vulnerabilities and led to widespread financial despair.