When Germany unleashed its blitzkreig in 1939, the U.S. Army was only the 17th largest in the world. FDR and George Marshall had to build a fighting force able to take on the Nazis, against the wishes of many in Congress.
In the largest protest of the Depression, World War I veterans converged on Washington, DC seeking justice. They were met with tanks, bayonets, and tear gas.
The nation was torn apart by disastrous riots in a hundred cities and towns, with lasting results.
Bill Veeck changed baseball forever, integrating the American League in 1949 and creating a variety of stunts and promotions to bring more people to the stadium.