In 1939, the world was on the brink of a major conflict as World War II began. The war officially started on September 1, when Germany, led by Adolf Hitler, invaded Poland. This aggressive action prompted Britain and France to declare war on Germany, marking the start of a global struggle that would last until 1945. The year also saw significant events in other areas, such as the introduction of the first commercially available television in the United States. Additionally, the New York World's Fair showcased innovations and cultural advancements, reflecting a world in transition before the chaos of war took hold.