Platoon Commander is a Real-Time Strategy game set in World War 2 and focused on the German advance toward Moscow in the fall and winter of 1941.
World at War is technically part of the Black Ops ... tool you can participate in), a guide to all multiplayer maps and game modes, and details on how to unlock all Black Ops 6 operators.
World War I involved 32 nations from 1914 to 1919. It redrew the world map and reshaped many borders in Europe. The collapse of the Russian Empire created Poland, the Baltics, and Finland.