How does the holocaust connect to the World War 2 timeline?

THE HOLOCAUST AND WORLD WAR II: KEY DATES

The mass murder of Europe’s Jews took place in the context of World War II. As German troops invaded and occupied more and more territory in Europe, the Soviet Union, and North Africa, the regime’s racial and antisemitic policies became more radical, moving from persecution to genocide. Explore a timeline of key events during the Holocaust and World War II.

i think it is the byzantine empire