World War II: United States President Franklin D. Roosevelt creates the National War Labor Board.

World War II or the Second World War was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks and aircraft played major roles, enabling the strategic bombing of cities and delivery of the first and only nuclear weapons ever used in war. World War II is the deadliest conflict in history, causing the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were tried for war crimes.

Franklin Delano Roosevelt, also known as FDR, was the 32nd president of the United States from 1933 until his death in 1945. He is the longest-serving U.S. president, and the only one to have served more than two terms. His first two terms were centered on combating the Great Depression, while his third and fourth saw him shift his focus to America's involvement in World War II.

The National War Labor Board, commonly the War Labor Board, was an independent agency of the United States government, established January 12, 1942, by an executive order of President Franklin D. Roosevelt, the purpose of which was to mediate labor disputes as part of the American home front during World War II.

January 12 is the 12th day of the year in the Gregorian calendar; 353 days remain until the end of the year.